Answer:
ARPANET
Explanation:
It was the ARPANET sponsored by the US Department of Defense to enable scientists collaborate on research.
The operating system is what allows the user to interact with the computer's hardware. It has basic services such as accepting commands from the user, managing, loading, and executing programs, and managing hardware resources. Some examples of operating systems are Windows, Linux, Mac OSX, and IOS.
Application software are pieces of software that perform specific tasks such as word processors.
