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Output of program

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What is the output of following program?
main ( )
{
union a
  {
    int i;
    char ch[z];
  }
union a,u;
u∙i=256
  printf (%d%d%d,u∙i,u∙ch[0],u∙ch[1] ); 
}

  1.   256 1 0
  2.   255 1 0
  3.   256 0 1
  4.  255 0 1
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