What is a requirement when authenticating a RESTCONF API session with a router that runs Cisco IOS XE Software?

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

Answer: B