For constant $a$,$\frac{d}{d x}\left(x^{x}+x^{a}+a^{x}+a^{a}\right)$ is

  • A
    $x^{x}(1+\log x)+a x^{a-1}$
  • B
    $x^{x}(1+\log x)+a x^{a-1}+a^{x} \log a$
  • C
    $x^{x}(1+\log x)+a^{a}(1+\log x)$
  • D
    $x^{x}(1+\log x)+a^{a}(1+\log a)+a x^{a-1}$

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