An application that you are managing has EC2 instances & Dynamo OB tables deployed to several AWS Regions. In
order to monitor the performance of the application globally, you would like to see two graphs:
1.) Avg CPU Utilization across all EC2 instances
2.) Number of Throttled Requests for all DynamoDB tables
How can you accomplish this?

A.
Tag your resources with the application name, and select the tag name as the dimension in the Cloudwatch Management console to
view the respective graphs.

B.
Use the Cloud Watch CLI tools to pull the respective metrics from each regional endpoint.
Aggregate the data offline & store it for graphing in CloudWatch.

C.
Add SNMP traps to each instance and DynamoDB table.
Leverage a central monitoring server to capture data from each instance and table.
Put the aggregate data into Cloud Watch for graphing.

D.
Add a CloudWatch agent to each instance and attach one to each DynamoDB table.
When configuring the agent set the appropriate application name & view the graphs in CloudWatch.

Explanation:
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Tools.CLI.html