Question $15(3$ points$)$

What is the output of the following code snippet?

$```$

#include

#include

using namespace std;

int main$()$

$\{$

cout $$ fixed $$ setprecision endl;

return $0$;

$\}$

$```$

$20$

$20\mathrm{.}0$

$20\mathrm{.}00$

$20\mathrm{.}000$