1.
The MS-DOS operating system is a .....

2.
Which of the following was an early desktop operating system that included an integrated graphic user interface with point-and-click features?

3.
The most recent version of the Mac OS is based on the ......... operating system.

4.
The ............ operating system was initially created in the early 1970s at AT & T Bell Labs.

5.
The essential difference between an operating system like Linux and one like Windows is that