Correct answer - "Check the Service IAM permissions" : Any authorization related failure directly
indicates to us that our first point of debugging should be validating the IAM permissions for
the service.
Incorrect:
"Check changes in CloudTrail" - You can make changes related to storage of your files and
receiving notifications but it does not affect authorization
"Check the recent changes in CloudWatch" - CloudWatch is a monitoring service therefore it does
not affect authorization
"Audit the S3 bucket CORS policy where the artifacts are stored" - Cross-origin resource sharing
(CORS) defines a way for client web applications that are loaded in one domain to interact with
resources in a different domain. CORS applies to web and not for internal AWS service
authorization