What must you do to fix a failed DSC configuration compile?

The correct action to take in response to a failed Desired State Configuration (DSC) compilation is to ensure that the configuration script is saved with the appropriate file extension, which is commonly .ps1 for PowerShell scripts. Saving the file as "mydscfile.ps1" is indicative of ensuring that the file is correctly recognized as a PowerShell script by the execution environment.

When a DSC configuration fails to compile, one of the first troubleshooting steps involves verifying the script's filename and extension to confirm proper recognition and execution. If the script is saved with an incorrect extension, the PowerShell engine may not parse it correctly, resulting in compilation errors.

This choice emphasizes the importance of proper file handling in scripting and ensures that the DSC engine can process and validate the configuration as intended. Other approaches, while they may seem viable, might not directly address the issue of compilation failure resulting from naming conventions and file types.