What improvement does EAP-FASTv2 provide over EAP-FAST?

A.
It support more secure encryption protocols.

B.
It allows multiple credentials to be passed in a single EAP exchange

C.
It addresses security vulnerabilities found in the original protocol.

D.
It allows faster authentication by using fewer packets.

Explanation:
EAP Chaining with EAP-FASTv2: As an enhancement to EAP-FAST, a differentiation was
made to have a User PAC and a Machine PAC. After a successful machine-authentication,
ISE will issue a Machine-PAC to the client. Then, when processing a user-authentication, ISE
will request the Machine-PAC to prove that the machine was successfully authenticated, too.
This is the first time in 802.1X history that multiple credentials have been able to be
authenticated within a single EAP transaction, and it is known as “EAP Chaining.”