you are the network administrator for northsim.com. the network consists of a single active directory domain. all the servers run windows server 2016. all the clients run windows 10. while working in active directory users and computers, you discover that an organizational unit (ou) that contained several group objects is missing. you do not know how long the ou has been missing. you select a backup from the previous week. you need to determine whether this backup contains the missing ou. you attempt to mount the snapshot using ntdsutil, but are not successful. you must mount the backup as an active directory snapshot.