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.
After a system is released and the user base grows, the demands on the development and support team will increase.
The development team can scale vertically by adding new people to the team.
Answer: just follow the instructions its like making a lego set
Answer:
Audio files have the ".mp3" file extension and compressed files have the ".zip" file extension.
Explanation: