Using the program in FIG $3,$ identify the value printed at line A$,$ B$,$ C$,$ and D$.$

$($Assume that the $$actual$$ system process ID of the parent is $2222$ and the child is $1111)$

Possible values

A $-$ pid $\_\_\_\_\_\_1111$ or $2222$ or $0$

B $-$ pid$1\_\_\_\_\_\_1111$ or $2222$ or $0$

C $-$ pid $\_\_\_\_\_\_1111$ or $2222$ or $0$

D $-$ pid$1\_\_\_\_\_\_1111$ or $2222$ or $0$

FIG $3$

int main$($void$)$

$\{$

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

pid $=$ fork$()$; $//$ fork a child process

pid$1=0$;

if $($pid $<0)//$ error

$\{$

fprintf$($stderr$,$ "Fork Failed"$)$;

return $1$;

$\}$

else if $($pid $==0)//$ child

$\{$

printf$("$pid $=\%$d

$",$ pid$)$; $//$ A

printf$("$pid$1=\%$d

$",$ pid$1)$; $//$ B

$\}$

else $//$parent

$\{$

wait$($NULL$)$;

printf$("$pid $=\%$d

$",$ pid$)$; $//$ C

printf$("$pid$1=\%$d

$",$ pid$1)$; $//$ D

$\}$

return $0$;

$\}$