An application uses an Amazon RDS MySQL DB instance that is running low on disk space. A solutions architect needs to increase the disk space without downtime and with minimal effort. Which solution meets these requirements?

Enabling storage autoscaling for an Amazon RDS MySQL DB instance allows the storage capacity to automatically increase when free space falls below a threshold, or when the forecasted growth indicates a need. This happens without downtime and requires minimal effort to configure, directly addressing the problem of low disk space. Increasing the RDS DB instance class size changes the compute and memory resources, not the storage capacity. Changing the RDS DB instance storage type to Provisioned IOPS affects performance (I/O operations per second), not the total storage size. The backup, restore, and stop process is a manual, multi-step operation that involves significant downtime and effort, which contradicts the requirements.