Which action resolves a 401 error in response to an HTTP GET that is issued to retrieve a configuration statement using RESTCONF on a CSR 1000V?

Which action resolves a 401 error in response to an HTTP GET that is issued to retrieve a configuration statement using RESTCONF on a CSR 1000V?

A. Change the HTTP method to PUT. B. Check the MIME types in the HTTP headers. C. Change the transport protocol to HTTPS. D. Check the authentication credentials.