What is the output of this program?#include <iostream>

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What is the output of this program?

#include <iostream>
    int main ()
    {
        int k;
        FILE * ptr;
        char buff[10];
        ptr = fopen ("Sample.txt", "w+");
        for ( k = 'A' ; k <= 'D' ; k++)
        fputc ( k, ptr);
        rewind (ptr);
        fread (buff, 1, 5, ptr);
        fclose (ptr);
        buff[3] = '\0';
        puts (buff);
        return 0;
    }

1. ABC
2. EFTLM
3. ABCDE
4. ABCD
5. None of these

Correct Option: A

In this program, We are setting the buffer size upto 3 only, So it is printing ABC.