Using special key combinations with cipher locks during emergency situations is called:

A.
Switch controls

B.
Key-override

C.
Master-keying

D.
Door delay

Explanation:
Key-overriding can be used during emergency situations or with
authorized personnel to gain immediate access. Master keying has to do with the
capability of reconfiguring the lock, as in resetting the access code. Door delay is
a control that sets off an alarm if a door is open for an extended period of time.