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Is there any difference between following declarations?

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1. 

Is there any difference between following declarations?

1 : extern int fun();
2 : int fun();
[A]. Both are identical
[B]. No difference, except extern int fun(); is probably in another file
[C]. int fun(); is overrided with extern int fun();
[D]. None of these

Answer: Option B

Explanation:

extern int fun(); declaration in C is to indicate the existence of a global function and it is defined externally to the current module or in another file.

int fun(); declaration in C is to indicate the existence of a function inside the current module or in the same file.

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