The Interrupting Time of a Circuit Breaker Is the Period

The interrupting time of a circuit breaker is the period between the instant of _________.

A) Initiation of short circuit and the arc extinction on an opening operation.
B) Energizing the trip circuit and the arc extension on an opening operation.
C) Initiation of short circuit and the parting of primary arc contacts.
D) Energizing of the trip circuit and the parting of primary arc contacts.