What statement accurately describes the functionality of the IEEE 802.1X standard?

What statement accurately describes the functionality of the IEEE 802.1X standard?
A . Port-based access control with EAP encapsulation over the LAN (EAPoL)
B . Port-based access control with dynamic encryption key management and distribution
C . Port-based access control with support for authenticated-user VLANs only
D . Port-based access control with mandatory support of AES-CCMP encryption
E . Port-based access control, which allows three frame types to traverse the uncontrolled port: EAP, DHCP, and DNS.

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Answer: A