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If \( \mathrm{A} \) is a square matrix such that \( \mathrm{A}^{2}=\mathrm{I} \), then \( (\mathrm{A}-\mathrm{I})^{3}+(\mathrm{A}+\mathrm{I})^{3}-7 \mathrm{~A} \) is equal to
(A) \( \mathrm{A} \)
(B) \( \mathrm{I}-\mathrm{A} \)
(C) \( \mathrm{I}+\mathrm{A} \)
(D) \( 3 \mathrm{~A} \)
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