Substances with giant covalent structures can serve as lubricants and also as cutting tools for hard materials. The diagrams illustrate the atomic arrangement in two giant covalent substances, P and Q. Which statement is correct?
- AOnly P is used as a cutting tool and only Q is used as a lubricant.
- BOnly P is used as a lubricant and only Q is used as a cutting tool.
- CP and Q are both used as cutting tools.
- DP and Q are both used as lubricants.