Given the C source code file:

int g $=0$;

int main$()$

$\{$

int x $=0,$ y $=10,$ z $=0$;

z $=$ max$($x$,$ y$)$;

$\}$

int max$($int a$,$ int b$)$

$\{$

return $($a $>$ b$)?$ a : b;

$\}$

Please select the correct statement about the variables g$,$ x$,$ y$,$ and z defined in the file: