A program is built from two .c files. The first file contains

      int a;
      static int b;
      extern int c;
      int d;

      void foo(void)
      {
        a = 1;
        b = 2;
        c = 3;
        d = 4;
      }

and the second file contains

      #include <stdio.h>

      static int a;
      static int b;
      int c;
      extern int d;

      extern void foo(void);

      int main()
      {
        a = 5;
        b = 6;
        c = 7;
        d = 8;
        foo();
        printf("%d %d %d %d\n",a,b,c,d);
        return 0;
      }

What does this program print?