A company received its latest bill with a large increase in the number of requests against Amazon SQS as compared to the month prior. The company is not aware of any changes in its SQS usage. The company is concerned about the cost increase and who or what was making these calls.
What should the SysOps Administrator use to validate the calls made to SQS?

A. AWS CloudTrail
B. Amazon CloudWatch
C. AWS Cost Explorer
D. Amazon S3 server access logs