Accurate records must be kept. Modern technology must be used. Investigations must be conducted by trained scientists. Observations must be made by more than one scientist.
I gave my students this multiple choice question: What must happen in order for scientific data to be verified through repetition?

Only one answer is correct among these 4 choices:
- Accurate records must be kept.
- Modern technology must be used.
- Investigations must be conducted by trained scientists.
- Observations must be made by more than one scientist.

Could you tell me which one is correct?

Accurate records must be kept.