A team of rescuers is boring through collapsed rock to free people trapped inside a cave. The drill has to be lubricated occasionally. Four claims are given about the materials chosen for the drill tip and the lubricant, to justify why they are used. 1. Diamond is used for the drill tip because it does not conduct electricity. 2. Diamond is used for the drill tip because it is very hard. 3. Graphite is used as the lubricant because it conducts electricity. 4. Graphite is used as the lubricant because it is soft and slippery. Which statements are correct?
- A1 and 3
- B1 and 4
- C2 and 3
- D2 and 4