我国采用以下哪种映射复用路径将2048Kbps信号复用成SDH信号?()
A.2Mbps→C12→VC12→TU12→TUG2→VC3→AU3→AUG→STM-N B.2Mbps→C12→VC12→TU12→TUG2→TUG3→AU3→AUG→STM-N C.2Mbps→C12→VC12→TU12→TUG2→TUG3→VC4→STM-N D.2Mbps→C12→VC12→TU12→TUG2→TUG3→VC4→AU4→AUG→STM-N E.2Mbps→C11→VC11→TU11→TUG2→TUG3→VC4→AU4→AUG→STM-N