What is the time complexity of function$1,$ if the complexity of function $2(n)$ is $n$ and function$3($n$)$ is $n^2$

Int function$1($n$)$

$\{$

function $2(n)$;

function $3(n)$ :

$3$

a$.O(2^{n}n)$

b$.O(n)$

c$.O(n^2)$

d$.O(n^4)$

e$.$ None of the Other Options