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Which of the following is not a standalone product?

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Which of the following is not a standalone product?

(a) pREC+ runtime support

(b) pSOS+m

(c) pSOS+

(d) pSOS+ kernel

This question was addressed to me by my college director while I was bunking the class.

This question is from Commercial Operating Systems in division Real Time Operating systems of Embedded Systems

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The correct answer is (a) pREC+ runtime support

Explanation: The pREC+ is not a standalone product it uses pSOS+m or pSOS+ for the input/output devices and task functions and calls the PHILE+ for the file and disk I/O.

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