Which two statements are true about clean restore points in a regular PDB? (Choose two.)
A. They require a clone instance to be created when used in a PDB flashback operation
B. They can be created for a PDB when connected to either the PDB or to the root
C. They require backups to be restored when used in a PDB flashback operation
D. They are created as guaranteed restore points
E. They can be created only if shared undo is enabled
F. They can be created only for a PDB in the mount state