What action should the Developer perform to make this error human-readable?

A Developer executed a AWS CLI command and received the error shown below:

What action should the Developer perform to make this error human-readable?
A. Make a call to AWS KMS to decode the message.
B. Use the AWS STS decode-authorization-message API to decode the message.
C. Use an open source decoding library to decode the message.
D. Use the AWS IAM decode-authorization-message API to decode this message.