Regarding the EnCase backup process $($EnCase $7\mathrm{.}04$ and newer$),$ which are the followingare true?A$.$ The case file backup is stored with a $.$cbak extension.B$.$ By default, the backup frequency is every $30$ minutes after completion of the previousbackup.C$.$ The evidence cache and the case folder are backed up$,$ except for EnCase evidence filesand the Temp and Export folders.D$.$ All of the above are correct.E$.$ Only B and C are correct.