* C. When performing a canary deployment, the database schema needs to be compatible with both the new version and the old version of the service to ensure smooth operation and rollback if necessary.
* A. Modifying the database schema, especially in a large and complex database, can be time-consuming and may negatively impact performance due to the migration processes and locks required during the
* schema change.
References:
* Canary Deployments
* Database Schema Changes