A Database Specialist needs to speed up any failover that might occur on an Amazon Aurora PostgreSQL DB cluster. The Aurora DB cluster currently includes the primary instance and three Aurora Replicas.
How can the Database Specialist ensure that failovers occur with the least amount of downtime for the application?

A. Set the TCP keepalive parameters low
B. Call the AWS CLI failover-db-cluster command
C. Enable Enhanced Monitoring on the DB cluster
D. Start a database activity stream on the DB cluster