A piece of conducting putty has been formed into a cylinder with length $60\,\text{mm}$ and diameter $20\,\text{mm}$. The resistance measured between the two ends of the cylinder is $20\,\Omega$. What is the resistivity of the putty?
- A$0.033\,\Omega\,\text{m}$
- B$0.10\,\Omega\,\text{m}$
- C$0.42\,\Omega\,\text{m}$
- D$5.2\,\Omega\,\text{m}$