$(10$ points$)$ Take a look at the following given information:

area$($a$,$b$)$: $0400000$

printf$($s$,...)$: $04002CC$

mystery$($a$,$b$)$: $0x4014F8$

main$($a$,$b$)$: $0x4018E4$

init$()$: $\}\{8\}$

pi: $010000000$

base: $010000004$

height: $010000008$

width: $01000000C$

radius: $010000010$

str$1$: $010000014$

On the CPU:

$$pc=0004002AC$

$$sp=07FFFFFB0$

$$ra=000401A08$

a$.$ What function is running? area$(a,b$

b$.$ Who called it$?$ main$(a,b$

c$.$ What's the stack depth? $3$

d$.$ What is the stack trace? area, main, init $($list the order that the functions have been called, beginning with the current one & ending with the first one.$)$

The runtime stack:

$\backslash$table$[[,],[,\frac{\text{d}\text{o}\text{t}\text{s}}{000000000}$

Please solve $11$ while showing and explaning the answers.