BоnusWhich оf the fоllowing аre аllowаble operations when the Gaussian elimination method is used to solve a system of linear equations?(i) A multiple of elements of one row may be added to the corresponding elements of any other row.(ii) Any two columns may be interchanged.(iii) All elements of any row may be squared.(iv) All of the elements of any row may be multiplied by any nonzero number.