Using the debug mpls l2transport signaling message command, what kind of attachment is connected?

00:19:51: AToM LDP [172.168.1.102]: Sending label withdraw msg vc type 4, cbit 1, vc id 100, group id 0, vc label 20, status 0, mtu 1500
00:19:51: AToM LDP [172.168.1.102]: Received label release msg, id 78 vc type 4, cbit 1, vc id 100, group id 0, vc label 20, status 0, mtu 0

A.
Frame over MPLS

B.
Ethernet over MPLS Port mode

C.
Ethernet over MPLS VLAN mode

D.
Ethernet VLAN mode to Ethernet Port mode