Q. If R = {(1, y), (1, z), (3, y)} then R power (-1)= ___________.

• (A) {(1, a), (y, z)}
• (B) {(y, 1), (z, 1), (y, 3)}
• (C) {(y, a), (1, z), (3, y)}
• (D) {(y, a), (z, a), (3, y)}