Utilize Delegated Administration to assign limited administrative privileges to users who are not administrators. Refer to https://help.salesforce.com/articleView?id=admin_delegate.htm&type=0&language=en_US&release=206.13 for more details.

The SalesforceA mobile app is designed specifically for System Administrators, and provides quick access to release notes, along with common administrative functions. Lightning Experience is the new user interface for the desktop version of Salesforce and Salesforce Classic is the old interface. There was also an old mobile application called Salesforce Classic, which has been phased out. Salesforce1 is the mobile app that you would use as an end-user of Salesforce to update records, but this app does not provide administrative functionality from directly within the app.

Workflow Rules and Processes could theoretically accomplish this, but you would have to perform some sort of edit on one record at a time in order for the Lead Source field to update on each. You could add a checkbox field on the Lead object called Update and mass-check that checkbox on the 200 records and then have the workflow or process fire based on that checkbox firing, followed by the action of the field update for the Lead Source, but that is more involved than just exporting using the Data Loader and then reimporting the update. The easiest way is via the List View option, as long as all of the Lead records have the same record type (you can't do mass inline editing from a list view if the records in the list view are of different record types).

Sharing Rules are used to extend access to data by making automatic exceptions to the organization-wide sharing settings. They can be based on record ownership or other criteria to share records with users in roles, groups, or territories.

Why the other options are incorrect:

A. Defines how users access objects and data, and what they can do within the application: This definition describes Profiles and Permission Sets, which control object-level and field-level access, as well as user permissions within Salesforce.

B. A collection of settings and permissions that give users access to various tools and functions: This definition is specific to Permission Sets, which grant additional permissions to users without changing their profiles.

C. None of the above: This is not correct as D is the appropriate definition.

Example:

If your organization-wide default for Account records is set to Private, but you want all Sales team members to see each other's accounts, you can create a Sharing Rule to automatically share accounts owned by Sales team members with the Sales role or group.

When the Organization-Wide Default (OWD) setting on Accounts is set to Private, users can only see their own records unless other sharing rules or access settings are applied.

Example:

If User A owns Account X and User B owns Account Y, User A will only see Account X in their report, and User B will only see Account Y in their report.

Use this component to guide sales reps through the stages of the sales process and prompt them to enter key field information and record activities. The Sales Path component is used on the Opportunity or Lead record detail pages. This feature has most recently been called simply Path, and is able to be added to objects beyond Leads and Opportunities in Lightning, although I doubt this will be appearing on the admin exam any time soon, I wanted to let you know. Please do message me if you see a question on the exam specific to Path (not Sales Path) -

Refer to https://help.salesforce.com/articleView?id=rss_sales_path.htm&type=0&language=en_US&release=206.13 for more details.

Permission Sets are used in Salesforce to extend users' functional access without changing their profiles. They allow you to grant additional permissions to specific users based on their needs.

Example:

If a user needs access to a specific object or feature that is not included in their profile, you can assign them a Permission Set that grants the required access without modifying their existing profile.

The only way a System Administrator can get into another user's personal report folder is if they are able to log in as that user and then navigate into it, so they can't technically access a user's personal folder directly. You have to have the Manage Public Reports permission in order to create Report Folders. Other users cannot see each other's personal report contents.

The Master-Detail relationship is created on the Detail Object as a new custom field specified as a Master-Detail relationship. Master-Detail Relationship fields are always created on the Detail (child) and related lists can be set to display on the page layout of the Master (parent). Junction objects have two master-detail relationships and are used to establish a many-to-many relationship in Salesforce.

Refer to https://help.salesforce.com/articleView?id=overview_of_custom_object_relationships.htm&type=0&language=en_US&release=206.13 for a good Objects Relationship Overview.

The Data Import Wizard can import up to 50,000 records at one time. It can also accommodate the importing of Lead Records, therefore this is the best selection.