What statements are true about 802.11-2012 Protected Management Frames? (Choose 2)

What statements are true about 802.11-2012 Protected Management Frames? (Choose 2)
A . 802.11w frame protection protects against some Layer 2 denial-of-service (DoS) attacks, but it cannot prevent all types of Layer 2 DoS attacks.
B . When frame protection is in use, the PHY preamble and header as well as the MAC header are encrypted with 256- or 512-bit AES.
C . Authentication, association, and acknowledgment frames are protected if management frame protection is enabled, but deauthentication and disassociation frames are not.
D . Management frame protection protects disassociation and deauthentication frames.

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Answer: AD