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A student appears for tests I, II and II...

A student appears for tests I, II and III. The student is successful if the passes either in tests I and II or tests I and III. The probabilities of the student passing in tests I, II and III are p,q and `(1)/(2)`, respectively. If the probability that the student is successful, is `(1)/(2)`, then

A

`p(1+q)=1`

B

`q(1+p)=1`

C

`pq=1`

D

`(1/p) + (1/q)=1`

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