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 BPD
B. The VLAN to instance mapping is a normal 12-byte field in the MST BPD
C. The VLAN to instance mapping is a 16-byte MD5 signature field in the MST BPD
D. The VLAN to instance mapping is a 12-byte MD5 signature field in the MST BPD