Which Statements Are True Regarding Databases During the Deployment of a New

Multiple Choice

Which statements are true regarding databases during the deployment of a new release of a service using canary deployment?

A) Changes to the database schema can take long and reduce the database performance.
B) Traffic to the database will significantly increase because of the additional service instance.
C) The database schema must be compatible to all running versions of a service.
D) The database is locked while its content is copied to the canary database.
E) Canary deployments require two synchronized instances of each database.