Let A = {9, 10, 11, 12, 13} and f:A→N be defined by f(n) = highest prime factor of n, then its range is
{13}
{3,5,11,13}
{11,13}
{2,3,5,11}
f(9) = 3, f(10) = 5, f(11) = 11, f(12) = 3, f(13) = 13