What would allow a network security administrator to authenticate and identify a user with a new BYOD-type device that is not joined to the corporate domain?

What would allow a network security administrator to authenticate and identify a user with a new BYOD-type device that is not joined to the corporate domain?
A . a Security policy with "known-user” selected in the Source User field
B . an Authentication policy with "known-user” selected in the Source User field
C . an Authentication policy with ‘unknown’ selected in the Source User field
D . a Security policy with “unknown” selected in the Source User field

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Answer: C