The piece of paper was worth a lot of money, it was an old Apple Inc what?
Options:
- notebook
- copy machine
- stock certificate
- ream
- thumb drive
Please answer and provide answer explanation.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Stock certificates have a lot of money as they are used for trading. Apple Inc can have stock papers which have a lot of value as they company is valueable. The final answer: stock certificate.