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

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

Answer: C