Given the following function, and

using the detailed model of

computing running time, what is

the runtime of the $5$th line of code?

public static float exp$3($float x$,$ int n$)\{$

float S $=1$;

float p $=1$;

for$($int i$=3$; in; i$++)\{$

p $=$ p$*($x$/$i$)$;

S $=$ S$+$p; $\}$

return $($S$)$;

$\}$

A$.3{}_{\text{f}\text{e}\text{t}\text{c}\text{h}}+{}_x+{}_{\frac{?}{?}}+{}_{\text{s}\text{t}\text{o}\text{r}\text{e}}$

B$.(3{}_{\text{f}\text{e}\text{t}\text{c}\text{h}}+{}_x+{}_{\frac{?}{?}}+{}_{\text{s}\text{t}\text{o}\text{r}\text{e}})n$

C$.$

D$.$