Which operation is equivalent to applying R1←R1+3R2R_1 \leftarrow R_1 + 3R_2R1←R1+3R2 and then R1←R1−3R2R_1 \leftarrow R_1 - 3R_2R1←R1−3R2?
Scaling R1R_1R1 by 3
Swapping R1R_1R1 and R2R_2R2
Adding R2R_2R2 to R1R_1R1 twice
The identity operation