Which three of these are types of Ethernet Virtual Connections (EVCs) in the MEF concept? ()
A、A.rooted multipoint EVC (E-Tree)
B、B.point-to-point EVC (E-Line)
C、C.point-to-multipoint EVC (E-Tree)
D、D.hub spoke EVC (E-Tree)
E、E.multipoint-to-multipoint EVC (E-LAN)