Suppose you have to write a program that will work as the single controlling

mechanism for switching off$/$ on your home appliances.

If you will go to the office, then it will do following operations:

Switch OFF Lights

Switch OFF TV

Enable Home Security System

Again when you will come back to home from office then following operations will

be performed:

Switch ON Lights

Switch ON TV

Disable Home Security System

Following classes were implemented for this system. Lights. TV$.$

HomeSecurtiySystem, are subsystem classes and class namely $x$ provides an

interface for client to access complex subsystem.

What is the name of this design pattern?