When network fail-over is enabled, which of the following is true?

A.
The fail-over cable status is ignored. Fail-over is determined by the network status only.

B.
Either a network failure or loss of voltage across the fail-over cable will cause a fail-over.

C.
A network failure will not cause a fail-over as long as there is a voltage across the fail-over cable.

D.
The presence or absence of voltage over the fail-over cable takes precedence over network fail-over.