What kind of database would be most suitable for this use case?

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Your application is onboarding a number of users. The details of the users very widely.

What kind of database would be most suitable for this use case?
A . NoSQL database like Firestore
B . OLAP database like BigQuery which support SQL
C . SQL database like MySQL or PostgreSQL
D . OLTP database like Cloud Spanner

Answer: A

Explanation: