The diagram shows a potential divider circuit. By changing the position of the contact X, it can be used to produce a variable potential difference across terminals P and Q. What are the limits of this potential difference?
- A$0\,\text{V}$ and $5\,\text{V}$
- B$0\,\text{V}$ and $20\,\text{V}$
- C$0\,\text{V}$ and $25\,\text{V}$
- D$5\,\text{V}$ and $25\,\text{V}$