备用电源系统（ABEX,HMG,SEP)向什么汇流条供电？

A、Essential DC bus(Using the TRU)

B、Essential AC bus(Using the E-inverter)

C、Essential DC bus(Using the TRU)和Essential AC bus(Using the E-inverter)

D、Essential DC bus(Using the E-inverter)和Essential AC bus(Using the TRU)