Which three combinations are valid LACP configurations that will set up a channel？（）

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.

A.lowest root bridge ID
B.lowest path cost to root bridge
C.lowest sender bridge ID
D.highest port ID
E.highest root bridge ID
F.highest path cost to root bridge