If the roots of the equation $x^2 - 8x + a^2 - 6a = 0$ are real,then what is the range of $a$?

  • A
    $-2 < a < 8$
  • B
    $-2 \leq a \leq 8$
  • C
    $2 < a < 8$
  • D
    $2 \leq a \leq 8$

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