An electrical heater has a current of $5.0\,\text{A}$. It is linked to the mains supply using a flexible cable that is able to carry up to $15\,\text{A}$. The mains circuit itself can carry up to $30\,\text{A}$. Several fuses are available for protecting the heater’s cable. Which fuse would be the most suitable choice?
- A$4.0\,\text{A}$
- B$10\,\text{A}$
- C$20\,\text{A}$
- D$40\,\text{A}$