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