What methodology does ESX Server use for the implementation of VLANs?

What methodology does ESX Server use for the implementation of VLANs?

A.
MAC-based policies

B.
protocol-based policies

C.
port group policies

D.
bonds

Explanation:
vSphere 4: Multi VLAN trunking on a port group (VGT).
vSphere 4 allows a port group to be configured with multiple VLANs