For which value of k does the pair of equations $x^2-y^2$ = 0 and $(x– k)^2$ + $y^2$ = 1 yield a unique positive solution of x?
(a).2
(b).0
(c)$ \sqrt{2}$
(d)$-\sqrt{2}$



[ A ]    a
right
[ B ]    b
[ C ]    c
[ D ]    d
Answer : Option A
Explanation :

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