Four students suggested different sets of points for sketching the complete graph of y=x1. Which student's set contains suitable points for both branches of the curve?
a) {(−1,−1),(−2,−21),(−4,−41)}
b) {(1,1),(2,21),(4,41)}
c) {(1,1),(−2,−21),(21,2),(−21,−2)}
d) {(2,1),(1,2),(−1,1)}