Suppose there is a class AirConditioner. The class supports the following behaviors: turning the air conditioner on and off. The following methods are provided for these behaviors: turn_on and turn_off. Both methods accept no arguments and return no value. There is a reference variable my_ac to an object of this class, which has already been created. Invoke a method to turn the air conditioner on.

The turn_on method for the AirConditioner object can be invoked by using the reference variable 'my_ac'. This is done by using the . (dot) operator and writing the line of code as: 'my_ac.turn_on();', which changes the object's state to 'on'.

Explanation:

In the context of object-oriented programming, the reference variable my_ac will be used to invoke the turn_on method associated with the AirConditioner object. To turn the air conditioner on, you will call the turn_on method using the . (dot) operator. It should be written as:

my_ac.turn_on();

This line of code is calling the turn_on method on the AirConditioner object that the my_ac variable is pointing to, which results in turning the air conditioner on. No arguments need to be passed into this method and it doesn't return a value; Its main function is to change the state of the AirConditioner object to 'on'.

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