If the difference between the roots of the equations $x^2 + ax + b = 0$ and $x^2 + bx + a = 0$ is the same and $a \neq b$,then:

  • A
    $a + b + 4 = 0$
  • B
    $a + b - 4 = 0$
  • C
    $a - b - 4 = 0$
  • D
    $a - b + 4 = 0$

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