Final answer:
For explaining and demonstrating a universal remote control, it is best to use a functional remote and have the customer repeat the actions. This hands-on method is more effective than using a nonfunctional remote or skipping a demonstration.
Step-by-step explanation:
When explaining and demonstrating the functions of a universal remote control, the most effective option among the given would be to use a functional remote to demonstrate, and then ask the customer to repeat the proper sequence of keystrokes in the same order as you demonstrated. This hands-on method facilitates active learning and ensures that the customer is capable of operating the remote by themselves. It would be unhelpful to use a nonfunctional remote for demonstration or to ask the customer to program the device without first showing them how to do it.
Universal remote controls typically operate via an infrared beam that requires a direct line of sight between the remote's emitter and the TV's detector. Some modern remotes now use Bluetooth technology, which relieves the necessity for a direct line of sight, making the devices more user-friendly and flexible in terms of positioning and operating distance.