SQL can be used to:

SQL (Structured Query Language) is a versatile language that can be used for various purposes in database management. It can be used to perform all the actions mentioned in the options:

Creating database structures: SQL allows you to create and define the structure of a database, including tables, relationships, constraints, and more.

Querying database data: SQL is primarily known for its ability to retrieve, filter, and manipulate data from a database using SELECT statements. This is a fundamental feature of SQL.

Modifying database data: SQL provides commands like INSERT, UPDATE, and DELETE to add, modify, or remove data from a database.

Therefore, SQL is a comprehensive language that can be used for all of the above purposes in database management.