Refer to the exhibit.

A frame on VLAN 1 on switch S1 is sent to switch S2 where the frame is received on VLAN 2.
What causes this behavior?

A.
trunk mode mismatches

B.
allowing only VLAN 2 on the destination

C.
native VLAN mismatches

D.
VLANs that do not correspond to a unique IP subnet