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Let matrix M(x) = [(0, (x-a), (x-b)), ((...

Let matrix `M(x) = [(0, (x-a), (x-b)), ((x+a),0,(x-c)),((x+b),(x+c),0)]`, then the matrix `(M(0)) (M(0))^T` `(a, b, c !=0)`, is (A) null matrix (B) skew-symmetric matrix (C) orthogonal matrix (D) symmetric matrix

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