यदि $u=\log \left(x^3+y^3+z^3-3 x y z\right)$ है,तो $(x+y+z)(u_x+u_y+u_z)$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $x-y+z$
  • C
    $2$
  • D
    $3$

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