When many sub classes are inherited from a single base class, it is known as …………… .

1. Hierarchical inheritance
2. Multiple inheritance
3. Single inheritance
4. Multilevel inheritance

How does a class encapsulate state and behaviour?

Explain visibility in terms of the following access modifiers:

1. public
2. private
3. protected
4. no modifier specified

Why is it a good idea to make all instance variables private?