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单项选择题

A switch port on TK1 is being configured to support 802.1Q trunking. 
Which of the following are true about 802.1Q trunking？（）

A.Both switches must be in the same VTP domain.
B.The encapsulation type of both ends of the trunk does not have to match.
C.The native VLAN on both ends of the trunk must be VLAN 1.
D.802.1Q trunking can only be configured on a Layer 2 port.
E.In 802.1Q trunking， all VLAN packets are tagged on the trunk link， except the native VLAN.

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A.spanning-tree guard root
B.spanning-tree portfast bpduguard default
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D.spanning-tree bpdufilter enable
E.spanning-tree portfast bpdufilter default