The correct answer is: A. keep track of things.
Reproducibility is the ability to repeat the same results from the same starting point. In scientific research, reproducibility is essential to ensure that the results of a study are reliable and can be trusted. There are a number of things that researchers can do to make their work reproducible, including:
- Keeping track of all data and materials used in the study.
- Documenting all steps in the research process.
- Using open-source software and data formats.
- Making data and materials available to other researchers.
By following these practices, researchers can help to ensure that their work is reproducible and can be built upon by others.
Option B, saving output, is not sufficient to make work reproducible. Output can be easily changed or manipulated, so it is important to keep track of the original data and materials used to generate it.
Option C, saving data in proprietary formats, can make work less reproducible. Proprietary formats are not accessible to everyone, so other researchers may not be able to use the data or reproduce the results.
Option D, none of the mentioned, is also not correct. All of the options mentioned are important for making work reproducible.