Which of the following notations have two repetitions of zero ?

(P) 1’s complement with radix of number being 2

(Q) 7’s complement with radix of number being 8.

(R) 9’s complement with radix of number being 10.

(S) 10’s complement with radix of number being 10

Select the correct answer using the codes given below:

(a) P,Q and S (b) P and R (c) Q, R and S **(d) P,Q and R**