An attacker on PC X sends a frame with two 802.1Q tags on it, one for VLAN 40 and another for VLAN 12. What will happen to this frame?
A. SW-A will drop the frame because it is invalid.
B. SW-A will leave both tags on the frame and send it to SW-B, which will forward it to hosts on VLAN 40.
C. SW-A will remove both tags and forward the rest of the frame across the trunk link, where SW-B will forward the frame to hosts on VLAN 40.
D. SW-A will remove the outer tag and send the rest of the frame across the trunk link, where SW-B will forward the frame to hosts on VLAN 12