Which three of these statements regarding 802.1Q trunking are correct?（）
- A 802.1Q native VLAN frames are untagged by default.
- B 802.1Q trunking ports can also be secure ports.
- C 802.1Q trunks can use 10 Mb/s Ethernet interfaces.
- D 802.1Q trunks require full-duplex, point-to-point connectivity.
- E 802.1Q trunks should have native VLANs that are the same at both ends.