An organization currently using tape backups takes one full backup weekly and incremental backups daily. They recently augmented their tape backup procedures with a backup-to-disk solution. This is appropriate because: 
A、fast synthetic backups for offsite storage are supported. 
B、backup to disk is always significantly faster than backup to tape. 
C、tape libraries are no longer needed. 
D、data storage on disks is more reliable than on tapes.