The label on a piece of copper wire shows: length $0.50\,\text{m}$ and diameter $0.50\,\text{mm}$. Which instruments would be the most appropriate for measuring the wire’s length and diameter accurately?
- Alength: metre rule; diameter: metre rule
- Blength: metre rule; diameter: micrometer
- Clength: calipers; diameter: metre rule
- Dlength: calipers; diameter: micrometer