How can the user track the calls made to CloudWatch?

An organization has configured the custom metric upload with CloudWatch. The organization has given permission to its employees to upload data using CLI as well SDK.

How can the user track the calls made to CloudWatch?
A . The user can enable logging with CloudWatch which logs all the activities
B . Use CloudTrail to monitor the API calls
C . Create an IAM user and allow each user to log the data using the S3 bucket
D . Enable detailed monitoring with CloudWatch

Answer: B

Explanation:

AWS CloudTrail is a web service which will allow the user to monitor the calls made to the Amazon CloudWatch API for the organization’s account, including calls made by the AWS Management Console, Command Line Interface (CLI., and other services. When CloudTrail logging is turned on, CloudWatch will write log files into the Amazon S3 bucket, which is specified during the CloudTrail configuration.