What is the meaning of using extern before function declaration?

For example following function sum is made extern

extern int sum(int x, int y, int z)
{
    return (x + y + z);
}

(A) Function is made globally available
(B) extern means nothing, sum() is same without extern keyword.
(C) Function need not to be declared before its use
(D) Function is made local to the file.


Answer: (B)

Explanation: extern keyword is used for global variables. Functions are global anyways, so adding extern doesn’t add anything.

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