Which three statements are true about the working of system privileges in a multitenant control database(CDB) that has pluggable databases (PDBs)?（）
- A System privileges apply only to the PDB in which they are used.
- B Local users cannot use local system privileges on the schema of a common user.
- C The granter of system privileges must possess the set container privilege.
- D Common users connected to a PDB can exercise privileges across other PDBs.
- E System privileges with the with grant option container all clause must be granted to a common user before the common user can grant privileges to other users.