Which one of the following relations defined from A = {0,1,2} to B = {a, b,c, d} is a function? Select one:
{0, a),(1,5),(1,c),(2,d)}
{(0, a),(1,6)
{(0,0),(0,5),(2,c),(3,d)}
{0, a),(1,0),(2,c)
{(0,0),(1,5),(2,C),(1,0)}