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					 The UNIX operating system is suitable for :
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                        - Multi-user
- Real-Time Processing
- Distributed Processing
- Single user
 
Correct Option: A
UNIX is a popular multi-user, multitasking operating system developed at Bell Labs in the early 1970s. Created by just a handful of programmers, UNIX was designed to be a small, flexible system used exclusively by programmers. It was designed to be portable, multi-tasking and multi-user in a timesharing configuration. 
 
	