In an electron micrograph, the mean width of mitochondria measures $6\ \text{mm}$. The electron micrograph has a magnification of $\times 9600$. What is the actual mean width of the mitochondria?
- A$6 \times 10^{-3}\ \text{mm}$
- B$6 \times 10^{-4}\ \text{mm}$
- C$6 \times 10^{-2}\ \mu\text{m}$
- D$6 \times 10^{3}\ \mu\text{m}$