4.An employee gains S500 from shirking. Thus, to deter shirking, the employer makes employees post a bond equal to $1,000, and installs monitoring devices to detect shirking. What is the probability that these devices can detect shirking?
(A) 30%
(B)100%
(C)50%
(D)95%

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統計: A(0), B(0), C(1), D(0), E(0) #2788632