On which line$($s$)$ is the setter function?

$```$

$1$

$2$ public class XYZ $\{$

$3$

$4$ private int a;

$*$ private double b;

$*$

$7\backslash$ominus public XYZ$()\{$

a $=0$;

b $=1\mathrm{.}23$;

$\}$

public XYZ$($int n$1,$ double n$2)\{$

a $=$ n$1$;

b $=$ n$2$;

$\}$

public int getA$()\{$return a;$\}$

public void setB$($double b$)\{$this$.$b $=$ b;$\}$

$\}$

$```$

Select one

A$.2$

B$.4$ and $5$

c$.\backslash (7-10\backslash )$

D$.\backslash (11\backslash$cdot $14\backslash )$

E$.15$

F$.16$