An amber CDS FAULT annunciation below each speed tape indicates:
A.A.The altimeter is receiving inputs from a source other than the ADIRU and should be considered unreliable unless verified by another source
B.B.A single DEU has been manually selected to drive all six display units
C.C.A non-dispatchable CDS fault has occurred
D.D.Single EFIS control panel has been manually or automatically selected as the source for all six display units
正确答案是C