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Q)

If $z=\sqrt{20i-21}+\sqrt{20i+21}$,then possible value of arg(z) equals

(A) $\;\large\frac{\pi}{4}$

(B) $\;\large\frac{\pi}{2}$

(C) $\;\large\frac{3\pi}{8}$

(D) $\;\pi$

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