Go with A - to achieve agility.

Keyword here is: ''manage'' and ''accounts''.

Correct answer is C.

"AWS Organizations " is the service that provides a quick and automated way to create and manage AWS accounts.

Amazon RDS provides high availability and failover support for DB instances using Multi-AZ deployments.

Amazon RDS uses several different technologies to provide failover support.

Multi-AZ deployments for Oracle, PostgreSQL, MySQL, and MariaDB DB instances use Amazon's failover technology.

SQL Server DB instances use SQL Server Database Mirroring (DBM).

Reference:

https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.MultiAZ.html

AWS abuse team is really the AWS Trust & Safety Team.

https://aws.amazon.com/premiumsupport/knowledge-center/aws-abuse-report/

CloudTrail:

Get an history of events / API calls made within your AWS Account by:

• Console

• SDK

• CLI

• AWS Services

So the correct answer is A.

Loosely coupled components. So the closest is C.

Answer is B. Lower CAPEX and variable OPEX.

AWS does NOT require minimum spend commitments or long-term contracts.

You replace large upfront expenses with low variable payments that only apply to what you use.

With AWS you are NOT bound to multi-year agreements or complicated licensing models.

Reference:

https://aws.amazon.com/economics/

A & C are correct answers.

Question is about a typical three-tier web application and how to improve availability ( which is clearly done by using distinct AZ's ).

AWS points of presence refers to edge locations and edges cache. These two concepts are more closed to Performance topics.

Think of always giving customer best service. If one instance it could get slow. More than one instance with load balance will give customer better experience.

Use load balancing for offloading encryption termination (TLS) to improve performance and to manage and route traffic effectively.

Distribute traffic across multiple resources or services to allow your workload to take advantage of the elasticity that AWS provides.

Reference:

https://d1.awsstatic.com/whitepapers/architecture/AWS_Well-Architected_Framework.pdf

Reference:

https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html