Which two statements about 10 Gigabit Ethernet （10GE） are true？（）

• A、10 Gigabit Ethernet does not support VLAN definition
• B、10 Gigabit Ethernet supports full duplex links， but does not support half duplex links
• C、10 Gigabit Ethernet supports unshielded or shielded twisted-pair cable connections
• D、10 Gigabit Ethernet supports Carrier Sense Multiple Access with Collision Detection （CSMA/CD）
• E、10 Gigabit Ethernet supports optical fiber connections in single mode only. Mufti mode is not supported