How does Cisco implement infrastructure MFP?

How does Cisco implement infrastructure MFP?

A.
Encrypting the management frames sent between APs and Cisco Compatible Extensions v5 clients

B.
Using a digital signature mechanism to insert a MIC into 802.11 management frames

C.
Using a securedEoIP management tunnel between the APs and controllers

D.
Using AES to encrypt all management frames between the clients,aps, and controllers

E.
Using 802.1X to authentication the APs