If $F(u) = f(x, y, z)$ is a homogeneous function of degree $n$ in $x, y, z$, then $x\frac{\partial u}{\partial x} + y\frac{\partial u}{\partial y} + z\frac{\partial u}{\partial z} = $

  • A
    $nu$
  • B
    $n F(u)$
  • C
    $\frac{n F(u)}{F'(u)}$
  • D
    None of these

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