With respect to the variety inherent in Big Data, structured data (the 20% of the data that is contained in relational databases) is to unstructured data (all the rest of the data) as

Question options:

1. Roads and signposts are to wilderness.

2. Faucets are to fire hoses.

3. Relational databases are to spreadsheets.

4. Natural language is to programming code.

5. Data is to metadata