Final answer:
The correct option to complete the PowerShell command to create a security group in Active Directory is 'GroupCategory'. This parameter determines whether the group is for distribution (e.g. email) or for security purposes (e.g. access control).
Step-by-step explanation:
To complete the following Windows PowerShell command for creating a security group in Active Directory, you would utilize the GroupCategory parameter. The correct syntax to create a security group named 'Sales' and specify its group scope and group category would be:
New-ADGroup -Name "Sales" -Path "OU=someOU,DC=example,DC=com" -GroupScope Global -GroupCategory Security
GroupCategory specifies whether the group is a distribution group or a security group, which in Active Directory is used to manage permissions to resources.