Which action will make the database MORE highly available?
Contact AWS Support to pre-warm the database to ensure that it can handle any unexpected spikes in traffic
Create a new Multi-AZ RDS DB instance. Migrate the data to the new DB instance and delete the old one
Create a read replica from the existing database outside of business hours
Modify the DB instance to outside of business hours to be a Multi-AZ deployment
Explanations:
Pre-warming the database does not address high availability or failover in case of a database failure. It only aims to improve performance during traffic spikes.
Creating a new Multi-AZ RDS instance and migrating data introduces downtime during the migration, which violates the requirement of ensuring minimal downtime during business hours.
Creating a read replica improves read scalability but does not address the issue of high availability for failover during a database failure.
Modifying the DB instance to Multi-AZ during off-peak hours ensures high availability by enabling automatic failover without causing customer disruption during business hours.
I estimate that the answer is:
Modify the DB instance to outside of business hours to be a Multi-AZ deployment