A Company Is Running Amazon RDS for MySQL for Its

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 then when Amazon RDS is down
C) Enable a read replicas and direct read traffic to it when Amazon RDS is down
D) Enable an Amazon RDS for MySQL Multi-AZ configuration