Consider the following C code:

int main$()$

$\{$ int d $=1$;

int e;

int c $=-1$;

c $=$ mysub$($d$,$d$,$e$)$;

exit$(0)$

$\}$

int mysub$($int a$,$ int b$,$ int c$)$

$\{$ int d$,$ e;

a $=$ a $+$ c;

return $($a$)$

$\}$

Presume that the system call stack starts at x$7000$ and moves "backwards" in memory, as had been standard in this class. Presume that while main$()$ is running $($and before mysub$()$ is callsed$)$ that R$5($the frame pointer$)$ contains the address x$6$FFA. Also presume that the program has been running, the subroutine mysub$()$ has been called, and it is JUST ABOUT to START executing the line of code:

a $=$ a $+$ c;

What hex value will be in location x$6$FFA?