The following description about the signal flow of the OTM site (OSN 8800 equipment), which is wrong?

The following description about the signal flow of the OTM site (OSN 8800 equipment), which is wrong?
A . Service sending direction: SDH signals-> LSX-> M40V-> OBU1-> Line
B . OSC receiving direction: Line-> FIU-> Sc2
C . Service receiving direction: Line->FIU-> OAU-> M40V-> LSX-> SDH signals
D . Service sending direction: SDH signals-> LSX->M40V-> OBU1-> FIU-> Line

Answer: C