4th Option is correct.
1.Relational databases are static schema so option A is wrong.
2.data stored as key/value pairs is JSON (semi-structured data)relationalDB are structured data. Option B is wrong
3. Storing large images and videos is unstructured data.Option c is wrong.
For this question I would select the 4th option however, I would only do that because this is the most correct out of all offered. The correct answer here is in fact incorrect because you do not have to resort to a relational database if you want to enforce ACID. There are many tools that can enforce ACID in other NoSQL databases, it does not makes relational databases the only way.
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