What is the "this" keyword used in Java?

A$.$ To create a new instance of a class

B$.$ To refer to the current instance of the class

C$.$ To access static members of the class

D$.$ To define constructors

Which keyword is used to prevent a class from being inherited by other classes?

A$.$ inherit

B$.$ sealed

C$.$ prevent

D$.$ final

Analyze the following code:

public class Test $1$

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

A a $=$ new A$()$;

a$.$print $()$;

$\}$

$\}$

class A $1$

String s;

A$($String s$)($

this.s $=$ s;

$\}$

void print$()\{$

System.out.println $($s$)$;

$\}$

$\}$

A$.$ The program has a compile error because class $A$ is not a public class.

B$.$ The program has a compile error because class A does not have a default constructor.

C$.$ The program compiles and runs fine and prints nothing.

D$.$ The program would compile and run if you change $Aa=$ new $A()$ to $Aa=$ new $A(5).$