Which three of these statements about Dynamic Trunking Protocol are correct？（）
- A It supports autonegotiation for both ISL and IEEE 802.1Q trunks.
- B It must be disabled on an interface if you do not want the interface to work as a trunk or start negotiation to become a trunk.
- C It is a point-to-multipoint protocol.
- D It is a point-to-point protocol.
- E It is not supported on private VLAN ports or tunneling ports.