A company is running Amazon RDS for MySQL for its workloads. There is downtime when AWS operating system patches are applied during the Amazon RDS-specified maintenance window.
What is the MOST cost-effective action that should be taken to avoid downtime?

A. Migrate the workloads from Amazon RDS for MySQL to Amazon DynamoDB
B. Enable cross-Region read replicas and direct read traffic to them when Amazon RDS is down
C. Enable a read replica and direct read traffic to it when Amazon RDS is down
D. Enable an Amazon RDS for MySQL Multi-AZ configuration