What is the purpose of using [Time Source] for authorization?

Refer to the exhibit.

Based on the information shown, what is the purpose of using [Time Source] for authorization?
A. to check whether the MAC address status is unknown in the endpoints table
B. to check whether the MAC address is in the MAC Caching repository
C. to check how long it has been since the last web login authentication
D. to check whether the MAC address status is known in the endpoint table.

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