Question: Two students A and B perform RREF on a given matrix X and obtain the same matrix X. Student C says both A and

Two students A and B perform RREF on a given matrix X

Two students A and B perform RREF on a given matrix X and obtain the same matrix X. Student C says both A and B cannot have the same RREF whereas D says that it is possible. A senior student E says that both A and B could be correct and it is actually possible to get X from X, provided none of the elements in X is zero. Who all are correct and why? (2)

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