Well think of it like this lets say this wasn't and security system and it was a video game console and remote.
Now the console or keypad or the main components the power on or shut off the devices and the remote or sensors are the secondary parts but they are needed to help the console or keypad figure out what they are doing.
Answer:
The first one I'm sorry if I'm wrong
They may not have enough money for the bill at the time, and its easier to pay for insurance for unseen medical procedures.
