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A unit vector in \( x y \)-plane makes an angle of \( 45^{\circ} \) with the vector \( \hat{i}+\hat{j} \) and an angle of \( 60^{\circ} \) with the vector \( 3 \hat{i}-4 \hat{j} \)
(A) \( \stackrel{A}{1} \)
(B) \( \frac{i+i}{\sqrt{2}} \)
(C) \( \frac{\hat{i}-\hat{1}}{\sqrt{2}} \)
(D) none of these
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