Consider the following code which creates a set of child processes

#include

#include

#include

int main$()$

$\{$

pid$\_$t pid$1,$ pid$2$;

pid$1=$fork$()$;

if $($pid$1!=0)\{$

$\}$ else $\{$

pid$2=$fork$()$;

$\}$

return $0$;

$\}$

How many processes are created when this program is run

$4$

$1$

$2$

$3$