$[25$ pts$.]$ a$)[15$ pts$.]$ Draw ARI stack configuration at program point $1$ for implementing dynamic scoping using the deep access method. Assume

main function calls fun$1,$ and fun$1$ calls fun$1,$ and, finally, fun$1$ calls fun$2.$

b$)[10$ pts$.]$ What is the referencing environment at program point $1?$

int fun $1($int $x,$ float $y$

int $a$;

float $b$;

$\}$

float fun $2($int $y,$ int $z)\{$

int $c$;

float a;

$...$

program point $1$

$\}$

int main$($int p$)\{$

int a;

int $b$;

float $c$;

float $d$;

int $x$;

$\}$