Which solution will remediate these errors in the LEAST amount of time?

Explanations:

Modifying the EBS volume to add additional space allows the application to continue running without downtime. After the modification, extending the file system can be done using file system-specific commands. This approach directly addresses the capacity issue and minimizes application disruption, making it the quickest solution.

Creating a snapshot and a new EBS volume takes additional time compared to directly modifying the existing volume. Although it allows for recovery and potential future use, it introduces unnecessary complexity and downtime, especially while waiting for the snapshot to complete.

This option involves creating a new volume, attaching it, and copying data, which is a time-consuming process. It requires additional steps for data transfer and would likely result in downtime for the application. This is not the most efficient way to resolve the capacity issue quickly.

Stopping the EC2 instance and changing its size is not only time-consuming due to the required downtime but also unnecessary since modifying the existing EBS volume can resolve the issue without stopping the instance. This option results in the longest downtime for the application.