I don't think some will write the whole program here, but which part are you having trouble with?
Operating System (OS) is the answer.
An application runs in/on an OS. It is not the OS itself. Like Word or Chrome are applications.
Systems is too generic and not specific enough to mean anything in this context. Throw away answer.
Network Operating System does not 'usually' run on a hard drive but on memory chips in things like routers, wireless access points and switches that move network traffic.
Answer:
general regulatory and speed control.
Answer:
Maintenance
Explanation:
Maintenance
This primarily involves updating and making improvements based on user feedback, as well as resolving any defects that arise.
