An Organization Has Configured the Custom Metric Upload with 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