B. Create custom indexes on the fields used in the filter criteria.

C. Create a formula field instead of having multiple filter criteria.

Explanation:

1. **Create Custom Indexes (Option B):** Custom indexes can significantly improve query performance, especially when filtering large datasets. By creating custom indexes on the fields used in the filter criteria, you can optimize the query execution time.

2. **Create a Formula Field (Option C):** Using a formula field can sometimes simplify complex filter criteria and improve query performance. Formulas are often processed more efficiently, reducing the load on the system during query execution.

Option A (Make sure the query doesn't contain NULL in any filter criteria) might not directly address performance issues related to large datasets and might not be the primary cause of query timeouts.

Option D (Modify the integration users' profile to have View All Data) is generally not recommended for troubleshooting query timeouts. Granting broad data access through "View All Data" should be done cautiously due to security considerations and is not a direct solution to performance issues....