If \( A \) and \( B \) are two matrices such that \( A+B \) and \( A B \) are both defined, then...

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If \( A \) and \( B \) are two matrices such that \( A+B \) and \( A B \) are both defined, then
(A) \( A \& B \) are two matrices not necessarily of same order
(B) \( A \) and \( B \) are square matrices of same order
(C) number of columns of \( A= \) number of rows of \( B \)
(D) none of these
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