Question $9$: Consider the Scala definitions:

enum Exp:

case Val $($n:Int$)$

case Plus $($e$1$:Exp, e$2$:Exp$)$

case Times $($e$1$:Exp, e$2$:Exp$)$

def f $($e:Exp$)$ : Int $=$ e match $\{$

case Val $($v$)=>$ v

case Plus $($e$1,$ e$2)=>$ f $($e$1)+$ f $($e$2)$

case Times $($e$1,$ e$2)=>$ f $($e$1)*$ f $($e$2)$

$\}$

With the above definitions, what is the outcome of running the following Scala code?

val sample $=$ Times $($Plus $($Val $(1),$ Val $(2)),$ Val $(3+4))$

println $($f $($sample$))$

A : The code runs successfully and prints: $21$

B : The code fails to compile because the parameter to Val is called n in the class declaration, but is called v in the

function f$.$

C : The code fails to compile because the parameter to Val is not a single Int but an expression $3+4.$

D : The code runs successfully and prints: $11$

E : The code runs successfully and prints: $10$