3. For each matrix shown, choose one of the following phrases that best describes the matrix. Give a brief justification for your choice. (a) The matrix is not in echelon form. (b) The matrix is in echelon form, but not in reduced echelon form. (c) The matrix is in reduced echelon form. 1 1 0 0 2 1 0 1 0 3 2 0 A = 0 B = 1 0 0 0 0 1 0 1 0 0 0 0 000 0 0 0 0 1 1 0 01 0 0 C = D=

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