What will be the output of the following Java program?

abstract class A 
{
    int i;
    abstract void display();
}    
class B extends A 
{
    int j;
    void display() 
    {
        System.out.println(j);
    }
}    
class Abstract_demo 
{
    public static void main(String args[])
    {
        B obj = new B();
        obj.j=2;
        obj.display();    
    }
}

What is inheritance in Java?

A. The process of acquiring properties and behaviors of one class by another

B. The process of creating objects

C. The process of encapsulation

D. The process of overloading methods

In Java, which keyword is used to implement inheritance between classes?

A. inheritsFrom

B. inherits

C. implements

D. extends

What is a superclass in Java?

A. The class that inherits properties and behaviors

B. The child class

C. The class that is inherited from

D. The class that is marked as "final"

In Java, can a subclass inherit constructors from its superclass?

A. Only if the subclass is marked as "final"

B. Yes, a subclass inherits constructors from its superclass

C. Only if the superclass is marked as "static"

D. None of the above