If A ={1, 2,3} and f, g, h and s are relations corresponding to subset A?A indicated against them, which of f, g , h and s are functions? In case of functions , find it's domain and range
1.f={(2, 1), (3, 3)}
2.g={(1, 2), (1, 3) , (2, 3), (3, 1)}
3.h={(1, 3), (2, 1), (3, 2)}
4.s={(1, 2), (2, 2) , (3, 1)}