Which of the following may NOT be an Economic benefit to a client using AWS cloud services?

Answer options:

A.The Client is running a dedicated MySQL Database Server on AWS with his own CPU bound license (BOYL).
B.The Client is running Spot Instances for batch data processing workloads.
C.The client is running applications with a relatively predictable & consistent resource Demand using AWS Reserved Instances.
D.The client is using S3 Intelligent Tiering storage class while uploading objects.
E.The client is using an Active - Passive failover routing strategy of his On - Premise Data Center to AWS cloud.

Answers: A
Option A is CORRECT. CPU bound software licenses will require a Dedicated Host tenancy model rather than a Shared tenancy model for the EC2 instances hosting the MySQL Database software. Dedicated hosts are the most expensive tenancy model when it comes to pricing. For example, an m4 large On Demand dedicated host is 24 times more expensive than an On-demand shared host. A dedicated host tenancy may be used under exceptional circumstances of spiky traffic, while purchasing Hardware On-Premise may not be the best option. Then the client can take advantage of Cloud Elasticity.
Option B is incorrect. Batch processing jobs rely more on accuracy rather than on speed which forms a good use case for using Spot Instances, providing economies of compute where intermittent disconnections may not be a real problem.
Option C is incorrect. AWS Reserved Instances have discounts on the EC2 usage. This method can provide an economic benefits.
Option D is incorrect. S3 Intelligent Tiering is a smart solution for managing the lifecycle of S3 objects resulting in economies of cost. With intelligent tiring, there are no retrieval fees nor there are any fees for moving objects between tiers unlike using S3 Lifecycle policies which incurs data transfer charges. S3 Lifecycle policies are also often challenging to define due to the unpredictable nature of application adoption and usage. Even in scenarios where access frequency is known, it may so happen that customers may not use proper storage class adjustments resulting in non-optimized budgets.
Option E is incorrect. An Active-Passive failover will always be economical to a client using the strategy for Disaster Recovery scenarios since he will not be investing in an entire redundant site with all resources running simultaneously. He will have the flexibility to select his strategy depending on his Recovery Time objectives. This will help him to save on costs.
References:
https://www.liquidweb.com/blog/private-cloud/
https://www.nutanix.com/blog/s3-intelligent-tiering-aws-cost-saving
https://www.xplenty.com/blog/the-5-types-of-data-processing/#batch
https://aws.amazon.com/ec2/dedicated-hosts/pricing/
https://aws.amazon.com/ec2/pricing/on-demand/