The correct answer is ".ps1", which is a PowerShell script file extension. PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and the associated scripting language. It is built into Windows and is commonly used for system administration tasks that involve advanced Windows configurations like setting up IIS and directory permissions, making it suitable for the described scenario. On the other hand, ".bat" files are batch files that are more suitable for simpler tasks and might not have the required capabilities for complex configurations. While ".vbs" (VBScript) files can be used for scripting on Windows, they are generally considered less powerful than PowerShell for system administration tasks. Lastly, ".sh" script files are for Unix/Linux shell scripting and are not natively supported on Windows.