This problem tests your understanding of exceptional control flow in C programs. Assume we are running

code on a Unix machine. The following problems all concern the value of the variable counter.

PartI$(12$points$)$

int counter $=0$;

int main$()$

$\{$

int i;

for $($i $=0$; i $<2$; i $++)\{$

fork$()$;

counter $++$;

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

$",$ counter$)$;

$\}$

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

$",$ counter$)$;

return $0$;

$\}$

A$.$ How many times would the value of counter be printed:

B$.$ What is the value of counter printed in the first line?

C$.$ What is the value of counter printed in the last line?