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Let 261 - 71 A = 131 - 3 | 1 3 4 0 Which of the following sequences of elementary row operations transforms A into row echelon form? (More than one answer may be correct.) (Zero or more options can be correct) a) R1: = R1 - R3, R2: = R2 - R1, R; : = R3 - R, and R: = R2. b) R Rz, R2: = R2 -2R, R3: = R3-R1, R2: = - R, and Rg = R3 -3R C) R1: = 2R,, R2 : = R2 - R1, R3 = R3 - R1, R3 : = R3 - 7R, and R, : = 2R2 . Select one: None b and c a