Consider the following code segment. $($Hint: A forked process is supposed to be a complete copy of its parent. except with threads in the parent. In other words, the parent's threads are left alone without beine duplicated!

pid$\_$t pid;

pid $=$ forkl $()$;

if child process $*/$

fork$2()$;

thread create $(...)$;

thread create$(...)$;

thread create$(...)$;

$\}$

fork$3()$;

fork$4()$;

How many unique processes are created $($including the parent process$)?$