7. Let A be an m x n matrix whose null space has dimension k. Which conclusion is correct?
(A) The dimension of Null(AT) is k.
(B) The dimension of row space of A is m-k.
(C) The dimension of column space of A is m-k.
(D) The dimension of row space of A is n-k.
(E) The dimension of column space of A is n-k.
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