Assume the code in FIG $1($below$)$ is submitted for execution. What will the code output?

A$.$ H$1$ END B END B H$2$ END A

B$.$ H$1$ END B H$2$ END B H$2$ END A

C$.$ H$1$ END A H$2$ END B END A

D$.$ None of the others.

FIG $1$

int main$($ void$)$

$\{$

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

pid $=$ fork$()$; $//$ fork a child process ASSUME FORK was SUCCESSFUL

if $($pid $==0)$

$\{$

printf$("$H$1")$;

$\}$

else

$\{$

wait$($NULL$)$;

pid $=$ fork $()$; $//$ fork a child process ASSUME FORK was SUCCESSFUL

if $($pid $>0)$

$\{$

wait$($NULL$)$;

printf$("$H$2")$;

$\}$

$\}$

If $($pid $>0)$

printf$("$END A $")$;

else

printf$("$END B $")$;

return $0$;

$\}$