Question

if a = {1,2,3,4} and b = {1,4,9,16,25} is a function of f is defined set a to b where f(x) = x2 then the range of fis

(a) {1,2,3,4}
(b) {1,4,9,16}
(c) {1,4,9,16, 25}
(d) none of these