Выберите фрагмент программы, в котором вычисляется сумма элементов побочной диагонали квадратной матрицы 3 * 3:

• s := 0;
  n := 3;
  for i := 1 to n do
  begin
  for j := 1 to n do
  begin
  s := s + arr
  \[i, j\]
  ;
  end;
  end;
  writeln\(s\);
• s := 0;
  n := 3;
  for i := 1 to n do
  begin
  for j := i to 3 do
  begin
  s := s + arr
  \[i, j\]
  ;
  end;
  end;
  writeln\(s\);
• s := 0;
  n := 3;
  for i := 1 to n do
  begin
  for j := 1 to n do
  begin
  if j = n + 1 - i then
  s := s + arr
  \[i, j\]
  ;
  end;
  end;
  writeln\(s\);
• s := 0;
  n := 3;
  for i := 1 to n do
  begin
  for j := 1 to n do
  begin
  if i = j then
  s := s + arr
  \[i, j\]
  ;
  end;
  end;
  writeln\(s\);