The minimum value of $f(x) = a^{a^{x}} + a^{1-a^{x}}$,where $a, x \in R$ and $a > 0$,is equal to ..... .

  • A
    $2a$
  • B
    $2\sqrt{a}$
  • C
    $a + \frac{1}{a}$
  • D
    $a + 1$

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