What is a disadvantage of using a relational database instead of a flat file to store, organize, and analyze data?

Relational databases organize data across related tables, so users may need to understand tables, relationships, and queries to work with them effectively. This makes them harder to use without prior knowledge than a simple flat file. They generally make filtering easier and help reduce duplicate information, so choices B and C describe advantages incorrectly.

AI-written and checked against the verified answer.