What error will the following function give on compilation?fun(int

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What error will the following function give on compilation?

fun(int x, int y )
{
    int x ;
    y = 54 ;
    return x ;
}

1. Missing parentheses in return statement
2. The function should be defined as int fun(int x, int y )
3. Re declaration of x
4. None of the above

Re declaration of a.