Which of the following is an elementary row operation that will produce a 1 in the (1,1) position of the augmented matrix 6 1 2 41 7 2 1 1 0 1 2 4 OR1 - R1 / 6 OR1 - R2 - R1 OR - RI - R2 All of the above work Both (A) and (C) work, but not (B)