A company deploys RDS for PostgreSQL Multi-AZ instances using a CloudFormation template that sets the allocated storage to 100 GB. Databases are created each Monday and removed on Friday. Occasionally they trigger CloudWatch alarms for low disk space. How can the administrator prevent the instances from running out of storage with the MINIMUM changes to the application?

Enabling storage autoscaling for RDS DB instances during creation is the most effective solution with minimum changes. This feature automatically scales the storage capacity of the RDS instance when it detects that free storage is running low, preventing outages due to insufficient disk space. The application itself does not need modification. Changing to Amazon Aurora PostgreSQL is a significant architectural change, not a minimum change, and doesn't inherently solve the storage growth issue without proper configuration. Replacing with Amazon DynamoDB is a NoSQL database, requiring extensive application refactoring, which is not a minimum change. Adding a CloudWatch alarm to run VACUUM is a reactive measure; VACUUM reclaims space but doesn't increase the allocated storage, so it won't prevent running out of disk space if the data volume continues to grow.