Question $2$: Consider the following C program.

void fun$1($void$)\{$

int a$,$ b$,$ c;

$//$ call another function

$\}$

void fun$2($void$)\{$

int d$,$ e$,$ f;

$//$ call another function

$\}$

void fun$3($void$)\{$

int c$,$ d$,$ e;

$//$ call another function

$\}$

void main $()\{$

int a$,$ f$,$ e;

$//$ call another function

$\}$

Given the following calling sequences and assuming that dynamic scoping is used, what

variables are visible during execution of the last function called? Include with each visible

variable the name of the function in which it was defined.