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Which allows the UNIX software to be ported using a simple recompilation?

(a) pSOS+

(b) UNIX compatible library

(c) pSOS+m

(d) pOS+kernel

I have been asked this question by my school principal while I was bunking the class.

This interesting question is from Debugging Techniques topic in chapter Emulation and Debugging Techniques of Embedded Systems

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Correct choice is (b) UNIX compatible library

For explanation I would say: The most of the operating system support or provide the UNIX-compatible library which supports the UNIX software to be ported using a simple recompilation.

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