列车TOD显示“ATO可用,ATPM不可用”,FerAm-log报VOBC DeterminAteD one of the TO

列车TOD显示“ATO可用,ATPM不可用”,FerAm-log报VOBC DeterminAteD one of the TOD is not funCtionAl。最不可能的直接原因是( )

A.TOD故障

B.CDU板卡故障

C.OBRU子架故障

D.VIM1故障

正确答案是D