For electrons moving through a metal conductor, the mobility $\mu$ can be found from $\mu = \left(\frac{e}{m}\right) \tau$ where $e$ represents the charge of an electron and $m$ is the electron’s mass. The average interval between one electron colliding with the atoms in the metal and the next is $\tau$. What are the SI base units for $\mu$?
- A$\text{A kg}^{-1}$
- B$\text{A s}^{2} \text{kg}^{-1}$
- C$\text{A s kg}^{-1}$
- D$\text{A s}^{-2} \text{kg}^{-1}$