Four wires are all made from the same metal. Which one has the largest resistance?
- Aa $100\,\text{cm}$ long wire with a diameter of $3.0\,\text{mm}$
- Ba $100\,\text{cm}$ long wire with a diameter of $6.0\,\text{mm}$
- Ca $10\,\text{cm}$ long wire with a diameter of $3.0\,\text{mm}$
- Da $10\,\text{cm}$ long wire with a diameter of $6.0\,\text{mm}$