If $S, T$ are symmetric matrices of the same order, then which of the following statements are true?
(A) $S + T$ is symmetric matrix (B) $ST - TS$ is skew symmetric matrix (C) $ST + TS$ is symmetric matrix (D) $ST - TS$ is symmetric matrix
(a) A, B, C (b) B, C, D(c) A, B, D (d) A, C, D
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