A.
{(1,1),(1,2),(1,3),(1,4),(2,1),(2,2),(2,3),(2,4),(3,1),(3,2),(3,3),(3,4),(4,1),(4,2),(4,3),(4,4)}
B.
{(1,2),(2,1),(1,1)(2,3),(3,4),(2,4),(4,1)}
C.
{(1,2),(2,1),(1,1)(2,3),(3,4),(2,4),(4,1),(4,2)}
D.
{(1,1),(1,2),(1,3),(1,4),(2,1),(2,2),(2,3),(2,4),(3,1),(3,2),(3,3),(3,4),(4,1),(4,2),(4,3)}