Given the following code, what is the base case of this function?

function factorial$($n$)$

$\{$

if $($n $==0)$

$\{$

$$ return $1$;

$\}$

$$else$$

$\{$

$$ return n $*$ factorial$($n $-1)$;

$\}$

$\}$

Group of answer choices

return $1$

The function call itself.

factorial$($n$)$

n $*$ factorial$($n $-1)$

n $==0$