What is the output of the following code:

class maths

t$.$

public int fact$($int $n)$

$\{$

int result;

if $)==(2$

return $1$;

result $=$fact$(n-1)=n$;

return result;

$3$

$\}$

class Program

$\{$

static void Main$($string$[]$ args$)$

$1$

maths obj$=$ new maths ;

Console. WriteLine$($obj$.$fact$(4))$;

Console.ReadLine $()$;

$\}$

$\}$

Select one:

a$.1$

b$.24$

c$.12$