What is the output of the following code:

int main$()$

$\{$

int $x=5$;

if $($fork$()==0)$

X$++$;

else

X$--$ ;

printf$("\%$d$\backslash$t$",x)$; $//$print value of $x$

return $0$ ;

$\}$

Select one:

a$.5$

b$.64$ or $46$

c$.6$

d$.4$