What are the two key measurements for the effectiveness of the detection function of a physical protection system? (PPS)

What are the two key measurements for the effectiveness of the detection function of a physical protection system? (PPS)
A . Probability of sensing adversary action and Implementation of effective countermeasures
B. Target identification and Isolation of the incident
C. Implementation of countermeasures Evaluation of effectiveness
D. Probability of sensing adversary action, Time required for reporting and assessing the alarm.

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Answer: A