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>
#include <string.h>
    int main()
    {
        char line[];
        fgets(line, 25, stdin);
        printf("%d\n", strlen(line));
        return 0;
    }

1. 25
2. Any length since line did not end with null character
3. Compilation Error
4. Runtime Error
5. None of these

Correct Option: C

Compilation Error

main.c: In function ‘main’:
main.c:5:14: error: array size missing in ‘line’
         char line[];