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