[不定项选择题]Choose two. Which two are true about backup encryption? A. The Transparent Data Encryption (TDE) keystore is backed up using RMAN. B. Vendor-specific media management software can be used for making Encrypted RMAN backups to media. C. The BACKUP BACKUPSET command can encrypt and decrypt backup sets. D. Image copies can be encrypted. E. Keystore-based encryption is the default mode for RMAN backup encryption. F. Backup encryption can be enabled selectively for specific tablespaces.