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.