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.
The three real-life objects that are instances of each of the following classes are given below:
a.<u> Song:</u>
The song Believe in yourself is an instance of song class
The song Where do broken hearts go is an instance of song class.
The song Ambition is an instance of song class
b. <u>CollegeCourse</u>
The College course Engineering is an instance of College course class
The College course Accounting is an instance of College course class
The College course Medicine is an instance of College course class
c. <u>Musician:</u>
The musician Rihanna is an instance of musician class.
The musician Sean Paul is an instance of musician class.
The musician Wyclef is an instance of musician class.
Real-life objects refer to the things that are characterized together as they share common qualities. The assignment simply wants you to name examples under the categories given.
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