What do we call the bolded statement in the code below?

#include

void swap$($int a$,$ int b$)$;

int main$()$

$\{$

int n $=3,$ m $=4$;

swap$($n$,$ m$)$;

printf$("$n $=\%$d$,$ m $=\%$d

$",$ n$,$ m$)$;

$\}$

void swap$($int n$,$ int m$)$

$\{$

int t $=$ n;

n $=$ m;

m $=$ t;

$\}$

Select One or More:

a$.$ function declaration

b$.$ function prototype

c$.$ function definition

d$.$ function header

e$.$ function include