If the difference between the roots of the equation $x^2 + ax + b = 0$ is equal to the difference between the roots of the equation $x^2 + bx + a = 0$ $(a \neq b)$,then:

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

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