How many rows and columns must a matrix A have in order to define a mapping from R? into R° by the rule T(x) = Ax? Choose the correct answer below. O A. The matrix A must have 9 rows and 7 columns. O B. The matrix A must have 7 rows and 7 columns. Oc. The matrix A must have 7 rows and 9 columns. O D. The matrixA must have 9 rows and 9 columns.

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