You have a web-style application with a stateless but CPU and memory-intensive web tier running on a cc2 8xlarge EC2
instance inside of a VPC. The instance when under load is having problems returning requests within the SLA as defined
by your business The application maintains its state in a DynamoDB table, but the data tier is properly provisioned and
responses are consistently fast. How can you best resolve the issue of the application responses not meeting your SLA?

A.
Add another cc2 8xlarge application instance, and put both behind an Elastic Load Balancer

B.
Move the cc2 8xlarge to the same Availability Zone as the DynamoDB table

C.
Cache the database responses in ElastiCache for more rapid access

D.
Move the database from DynamoDB to RDS MySQL in scale-out read-replica configuration

Explanation:
DynamoDB is automatically available across three facilities in an AWS Region. So moving in to a same AZ is not possible
/necessary. In this case the DB layer is not the issue, the EC2 8xlarge is the issue; so add another one with a ELB infrond of it.
See also: https://aws.amazon.com/dynamodb/faqs/