You are required to design an application that organizes people residing in buildings. The application has a number of buildings, in each building there are apartments , and each apartment has a family residing in it.

Assuming that apartments are one of two types: either rented or owned , which object-oriented concept you will use to define the two types of apartments in your application?

a. Inheritance

b. Abstraction

c. Polymorphism

d. Composition

e. Encapsulation