A skew-symmetric matrix \( S \) satisfies the relation \( S^{2} \) ...

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A skew-symmetric matrix \( S \) satisfies the relation \( S^{2} \)
\( \mathrm{P} \) \( +I=0 \), where I is a unit matrix, then \( \mathrm{SS}^{\mathrm{T}} \) is

W
(A) \( I \)
(B) \( 2 I \)
(C) \( -I \)
(D) \( -2 I \)
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