Which of the following is TRUE about the matrices below: 1 2 -1 0. A =0 0 1 4 0.0 0 1 0 4 D =0 0 1 3 0 0.0 1 0 1 4 B = 2 3 O Only A and D are in row-echelon form. O All matrices are in row-echelon form. O Only B is in row-echelon form. O Only A and B are in row-echelon form.

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