What is the output of the following Java program?

class A

int $k=1$;

public void System.out.println$("$A$")$; $\}$

$\}$

class B extends A$\{$

int $k=2$;

public void System.out.println$("$B$")$; $\}$

$\}$

public class $C$ extends

int $k=3$;

public void System.out.println$("$C$")$; $\}$

public static void main$($String$[]$ args$)\{$

$B$ b $=$ new $C()$;

System.out.print$($b$.$k$)$;

b$.F()$;

$\}$

Select one:

$3$B

$2C$

$1A$

$3$C

$2$B

The correct answer is: $2C$