A Developer Has Completed the Implementation of a REST API

A developer has completed the implementation of a REST API, but when it is executed, it returns a 401 error message. What must be done on the API to resolve the issue?

A) Access permission to the resource must be granted, before the request.
B) Configure new valid credentials.
C) The requested API endpoint does not exist, and the request URL must be changed.
D) Additional permission must be granted before the request can submitted.