We already have a lot of great tools place to help ensure confidentiality, but we should certainly review them to make sure we are doing the best we can. They include$$Which of the folllowing $?$encryption of sensitive data authentication and access control, which are done through usernames and passwords in the directoryaccess control at various levels ; and physical security such as locks and name badge access cardsOr$$redundancy at multiple levels from supply of power and network connectivity to server clusters and RAID configurations for hard disk drivesOr$.$ backups of all data, which are kept offsite in case there is a disaster $,$ as well as checksums and other data corrections mechanisms