Final answer:
The Add-Computer cmdlet in PowerShell can join multiple computers to a domain using a comma-separated list of names provided to the -ComputerName parameter.
Step-by-step explanation:
The question is about how to use the Add-Computer cmdlet in PowerShell to join multiple computers to a domain. The -ComputerName parameter of this cmdlet accepts multiple values. To specify multiple computer names, you can use a comma-separated list of names as valid values for this parameter. For example, -ComputerName "Computer1","Computer2","Computer3" will join the computers named Computer1, Computer2, and Computer3 to the specified domain.