A cluster group is a special failover cluster role that contains common resources for all nodes. You have two options:
This option is recommended in most cases. The new cluster group will contain all common resources that relate to the Administration Server instance.
Select this option if you want to use a common resource that is already associated with an existing cluster group. For example, you may want to use this option if you want to use a storage associated with an existing cluster group and if there are no other available storage for a new cluster group.