Which method does a connected trunk port use to tag VLAN traffic?

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Question:
Which method does a connected trunk port use to tag VLAN traffic?

IEEE 802 1w
IEEE 802 1D
IEEE 802 1Q
IEEE 802 1p

Explanation: IEEE 802.1Q is the networking standard that supports virtual LANs (VLANs) on an Ethernet network. When a frame enters the VLAN-aware portion of the network (a trunk link, for example), a VLAN ID tag is added to represent the VLAN membership of that frame. The picture below shows how VLAN tag is added and removed while going through the network.

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