Why does the switch fail to run UBT for the user?

Refer to the exhibits.

A network administrator deploys User Based Tunneling (UBT) in a corporate network to unify the security policies enforcement. When users authenticate with 802.1X, ClearPass shows Accept results, and sends the Aruba-User-Role attribute as expected. However, the AOS-CX based switch does not seem to build the tunnel to the Mobility Controller (MC) for this user.

Why does the switch fail to run UBT for the user?
A . The switch has not fully associated to the M
C . ClearPass is sending the wrong Vendor I
E . The switch is not configured with the gateway-role.
F . ClearPass is sending the wrong VSA type.
G . The switch is not configured with the port-access role.

Answer: B