Which command can you use to determine the version of Powershell installed on your server?

The correct choice, which involves using $PSVersionTable, is based on its functionality to provide detailed information about the PowerShell environment, including the version number of PowerShell that is currently installed. When executed, this command returns an object that includes various properties related to the version of PowerShell, making it a comprehensive tool for obtaining version information.

The other options do not accurately reflect valid commands in PowerShell for retrieving the version information. For instance, "Get-PSVersion" and "Show-PSVersion" are not standard commands recognized by PowerShell, meaning they would not work. Similarly, "Check-PSVersion" does not exist as a command and would also fail to execute any version-checking for PowerShell.

Thus, the use of $PSVersionTable is an established and correct method to identify the installed PowerShell version, distinguishing it as the best choice among the listed options.