If the polynomial $f(x) = \left|\begin{array}{ccc} (1+x)^{a} & (2+x)^{b} & 1 \\ 1 & (1+x)^{a} & (2+x)^{b} \\ (2+x)^{b} & 1 & (1+x)^{a} \end{array}\right|$, then the constant term of $f(x)$ is ($a$ and $b$ are positive integers).

  • A
    $2 - 3 \cdot 2^{b} + 2^{3b}$
  • B
    $2 + 3 \cdot 2^{b} + 2^{3b}$
  • C
    $2 + 3 \cdot 2^{b} - 2^{3b}$
  • D
    $2 - 3 \cdot 2^{b} - 2^{3b}$

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