What is the effect of applying the switchport trunk encapsulation dot1q command to a port on a Cisco Catalyst switch？（）

• A、By default， native VLAN packets going out this port will be tagged.
• B、Without an encapsulation command， 802.1Q will be the default encapsulation if DTP fails to negotiate a trunking protocol.
• C、The interface will support the reception of tagged and untagged traffic.
• D、If the device connected to this port is not 802.1Q-enabled， it will not be able to handle 802.1Q packets.