1X access control, which three protocols are allowed through the switch port before authentication t

In the use of 802.1X access control, which three protocols are allowed through the switch port before authentication takes place? (Choose three.)

A.
STP

B.
CDP

C.
EAP MD5

D.
TACACS+

E.
EAP-over-LAN

F.
protocols not filtered by an ACL