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Declarations and Initializations - Programming

Q1:

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

ANS:A - Both are identical

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.