Fill the blanks: ____ helps us track AWS API calls and …

Fill the blanks: ____ helps us track AWS API calls and transitions, ____ helps to understand what resources we have
now, and ____ allows auditing credentials and logins.

A.
AWS Config, CloudTrail, IAM Credential Reports

B.
CloudTrail, IAM Credential Reports, AWS Config

C.
CloudTrail, AWS Config, IAM Credential Reports

D.
AWS Config, IAM Credential Reports, CloudTrail

Explanation:
You can use AWS CloudTrail to get a history of AWS API calls and related events for your account. This includes calls
made by using the AWS Management Console, AWS SDKs, command line tools, and higher-level AWS services.
http://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrail-user-guide.html