Final answer:
The correct powershell command to reset a user's password to a specific value and require a change at their next login is option b) Reset-Password -User -ChangeRequired $true.
Step-by-step explanation:
The correct powershell command to reset a user's password to a specific value and require a change at their next login is option b) Reset-Password -User <username> -ChangeRequired $true.
This command allows you to target a specific user and set their password to a desired value. Additionally, it includes the -ChangeRequired $true flag, which forces the user to change their password at their next login.
An example usage of this command would be:
Reset-Password -User jdoe -ChangeRequired $true