B and E. Pay as you go and VARIABLE.

"The cloud allows you to trade fixed expenses (such as data centers and physical servers) for VARIABLE expenses, and only pay for IT as you consume it. And, because of the economies of scale, the VARIABLE expenses are much lower than what you would pay to do it yourself. "

https://d0.awsstatic.com/whitepapers/aws_pricing_overview.pdf

C and E are correct.

There are 3 types of AWS load balancers: Application, Classic and Network .

AWS offers you a pay-as-you-go approach for pricing for over 160 cloud services.

With AWS you pay only for the individual services you need, for as long as you use them, and without requiring long-term contracts or complex licensing.

AWS pricing is similar to how you pay for utilities like water and electricity.

You only pay for the services you consume, and once you stop using them, there are no additional costs or termination fees.

Reference:

https://aws.amazon.com/pricing/

B is correct. Cloudfront edge locations are key for low latency.

AWS Artifact is your go-to, central resource for compliance-related information that matters to you.

It provides on-demand access to AWS's security and compliance reports and select online agreements.

Reports available in AWS Artifact include our Service Organization Control (SOC) reports, Payment Car Industry (PCI) reports, and certifications from accreditation bodies across geographies and compliance verticals that validate the implementation and operating effectiveness of AWS security controls.

Agreements available in AWS Artifact include the Business Associate Addendum (BAA) and the Nondisclosure Agreement (NDA).

Reference:

https://aws.amazon.com/artifact/

Since RDS is an AWS Managed service, customers can use EC2 instances to install their DB of choice and self manage the same.

Reference : https://aws.amazon.com/blogs/database/best-storage-practices-for-running-production-workloads-on-hosted-databases-with-amazon-rds-or-amazon-ec2/

Access to support engineers is as well provided with the Business support plan.

So the answer is B- TAM (technical account manager) - it's a feature unique to the Enterprise support.

It's asking about geographic area which means regions.

So If a region fails then it's done. Correct option is C.

You can continue to optimize your spend and keep your development costs low by making sure you revisit your architecture often, to adjust to your startup growth.

Manage your cost further by leveraging different options such as S3 CloudFront for caching & offloading to reduce cost of EC2 computing, as well as Elastic Load Balancing which prepares you for massive scale, high reliability and uninterrupted growth.

Another way to keep costs down is to use AWS Identity and Access Management solutions (IAM) to manage governance of your cost drivers effectively and by the right teams.

Reference:

https://aws.amazon.com/startups/lean/

It's D: Agility is exactly about adapting to changing requirements.

Elasticity is about scaling in and out.

Also, elasticity is maybe more a feature than a characteristic