A company uses a single-node Amazon RDS for MySQL DB instance for its production database. The DB instance runs in an AWS Region in the United States.
A week before a big sales event, a new maintenance update is available for the DB instance. The maintenance update is marked as required. The company wants to minimize downtime for the DB instance and asks a database specialist to make the DB instance highly available until the sales event ends.
Which solution will meet these requirements?

A. Defer the maintenance update until the sales event is over.
B. Create a read replica with the latest update. Initiate a failover before the sales event.
C. Create a read replica with the latest update. Transfer all read-only traffic to the read replica during the sales event.
D. Convert the DB instance into a Multi-AZ deployment. Apply the maintenance update.