If \( \sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{\pi}{2} \), then the value of \( x^{2}+y^{2}+...

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If \( \sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{\pi}{2} \), then the value of \( x^{2}+y^{2}+z^{2} \) \( +2 x y z \) is equal to
(A) 1
(B) 2
(C) 3
(D) undefined
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