Name: Aamina Binte Khurram
Assignment no. 1: Security System

The main class, SecuritySystem, extends 3 subclasses:
1) Sensors, which extends 8 subclasses of its own
2) Alarm
3) Lights

There exists an is-a relationship between:
objects of sensor class and security system class,
objects of alarm class and security system class, and
objects of lights class and security sytem class.

There exists a has-a relationship between:
objects of sensor subclasses and alarm class, and between
bjects of sensor subclasses and the lights class.