What will be the output of the following C code (when 4 and 5 are entered)?

#include <stdio.h>
void main()
{
    int m, n;
    printf("enter a number");
    scanf("%d", &n);
    scanf("%d", &m);
    printf("%d\t%d\n", n, m);
}

A. stdio.h B. iostream.h C. fileio.h D. files.h

A. fopen() B. open() C. writefile() D. createfile()

A. A built-in data type for files B. A file descriptor C. A file pointer D. A file structure

A. Use the 'filestatus' variable B. Check the return value of fopen() C. Use the 'fileopen' function D. Check the file's size