Correct answer - "CloudTrail" : With CloudTrail, you can log, continuously monitor, and retain
account activity related to actions across your AWS infrastructure. It is a good tool for
auditing and compliance purposes.
Incorrect:
"CloudWatch Metrics" - Its a monitor tool for example to monitor CPU usage of a particular EC2
instance
"X-Ray" - More appropriate for the application level as it helps with tracking requests made to
your applications
"CloudWatch Alarms" - Used for watching a single CloudWatch metric and not API calls