How is the response function of a physical protection system (PPS) measured

How is the response function of a physical protection system (PPS) measured
A . The response function of a PPS is measured by the time between receipt of communication of adversary action and the arrest of the adversary
B. The response function of a PPS is measured by the time between the alarm time and incident closure
C. The response function of a PPS is measured by the time between receipt of communication of adversary action and the arrival of law enforcement
D. The response function of a PPS is measured by the time between receipt of communication of adversary action and the interruption of the adversary action

Answer: D