is there any difference between following declarations 1 extern int fun, Basic, C++

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Question: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

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Question: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

B