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.