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:
A closing tag
Explanation:
A tag in HTML is the core building block that marks the presence of an element. If the element has text or another element within it, it is marked using a two-sided tag and in which case, the opening tag indicates the content’s beginning and a closing tag indicates the end of the content
Answer:
Information And Communication Technology
