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When a C program is started, O.S environment is responsible for opening file and providing pointer for that file?

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When a C program is started, O.S environment is responsible for opening file and providing pointer for that file?

(a) Standard input

(b) Standard output

(c) Standard error

(d) All of the mentioned

The question was posed to me in an online quiz.

Question is taken from File Access topic in chapter Input and Output in C of C

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Right option is (d) All of the mentioned

The best explanation: None.

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