Which statement about authenticating a RESTCONF API session with a router that runs Cisco IOS XE Software is true?

Which statement about authenticating a RESTCONF API session with a router that runs Cisco IOS XE Software is true?
A. No authentication is required.
B. OAuth must be used.
C. A token must be retrieved and the associated string must be embedded in the X-Auth-Token header.
D. Basic authentication must be used.

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