In 802.1s, how is the VLAN to instance mapping represented in the BPDU?()
A、The VLAN to instance mapping is a normal 16-byte field in the MST BPDU.
B、The VLAN to instance mapping is a normal 12-byte field in the MST BPDU.
C、The VLAN to instance mapping is a 16-byte MD5 signature field in the MST BPDU.
D、The VLAN to instance mapping is a 12-byte MD5 signature field in the MST BPDU.