What is the outcome of below code Rectangle

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What is the outcome of below code Rectangle_Example class?

class Shape 
{
	public int area()
        {
		return 2;
	}
}

class Rectangle extends Shape 
{
	public int area()
        {
		return 6;
	}
}

public class Rectangle_Example
{
   public static void main(String[] args)
   {
	Shape obj = new Shape();
	Rectangle obj0 = new Rectangle();
	obj = obj0;
	System.out.println(obj.area());
   }
}

1. 6
2. Runtime Error
3. Default Value
4. Compilation Error
5. None of these

Correct Option: A

Child object can be assigned to parent variable without change in behaviour.