The need for joining data

Your team is working on a project to reduce player concussions in American football. You've decided to use Python going forward, which is a change from the team's traditional spreadsheet-based environment. What will not change is one of your first steps in data preparation - joining data from different sources.

Which statement about joining data is not true?

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Possible Answers

Joining data is necessary when including data from different organizations.
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Data is often stored in separate files that are split by department, geography, or time.
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Groups responsible for storing data are often too busy to do it themselves.
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Databases often contain a multitude of tables to improve storage efficiency.
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