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					 What does BIOS stand for?
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                        - Basic Internal Output System
- Basic Intra Operating System
- Basic Internal Organ System
- Basic Input Output System
 
Correct Option: D
In IBM PC compatible computers, the Basic Input/Output System (BIOS), is the de facto standard defining a firmware interface. The name originated from the Basic Input/Output System used in the CP/ M operating system in 1975. 
 
	