What does the following program print?

static void Main $($string$[]$ a$[$gs$)$

$\{$

int fint $n)$

$\{$

if $(n1)$

return $1$;

if $(n**2==0)$

return $f(\frac{n}{2})$; ${?}_{(})$

$\}$

return $f(\frac{n}{2}{)}_{+}f(\frac{n}{2}+1)$;

Consolewhicitadine $(f(11))$;

$\}$

Consple Beadline$()$;

$\}$

Select one

A$.5$

B$.1$

C$.11$

D$.$ Infinite loop