What is the significance of using the [Allow ALL MAC AUTH] as an Authentication Method for Guests?

What is the significance of using the [Allow ALL MAC AUTH] as an Authentication Method for Guests?
A . This removes the reliance on the known or unknown status for MAC authentication.
B . All clients with unknown endpoints will be granted guest access regardless of authorization
C . Client attempts will fail without an additional Authentication method applied.
D . All clients with known endpoints will be granted guest access regardless of authorization.

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Answer: A