Which of the following statements are true?

1. Accounting transactions are stored in the operational database.
2. A database administrator is responsible for designing the database.
3. The result of a query could be a report.
4. Deletion, insertion, and update problems are solved by normalization.
5. A data warehouse stores only future data.
6. An intersection table refers to the intersection of queries and reports.
7. A composite primary key consists of more than one field.