The core Company switches are configured to use 802.1Q trunks.  Which three statements are  correct with regard to the IEEE 802.1Q standard？（）

• A、 The IEEE 802.1Q frame format adds a 4 byte field to a Ethernet frame
• B、 The packet is encapsulated with a 26 byte header and a 4 byte FCS
• C、 The protocol uses point-to-multipoint connectivity
• D、 The protocol uses point-to-point connectivity
• E、 The IEEE 802.1Q frame uses multicast destination of 0x01-00-0c-00-00
• F、 The IEEE 802.1Q frame retains the original MAC destination address