What will be the output of the following C code?#include

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What will be the output of the following C code?

#include <stdio.h>
    void function(int);
    void (*fun)(void) = function;
    int main(int argc, char *argv[])
    {
        fun(20);
        return 0;
    }
    void function(int k)
    {
        printf("%d\n", k);
    }

1. Compilation Error
2. Garbage value
3. 20
4. Runtime Error
5. None of these

Correct Option: A

Compilation Error

main.c:3:25: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
     void (*fun)(void) = function;
                         ^~~~~~~~
main.c: In function ‘main’:
main.c:6:9: error: too many arguments to function ‘fun’
         fun(20);