Which statement is true regarding virtual private catalogs？（）  

• A、 A virtual private catalog owner can create a local stored script， and have read/write access to a global stored script.
• B、 The virtual private catalog owner cannot create and modify the stored scripts.
• C、 The set of views and synonyms that make up the virtual private catalog is stored in the schema of the RMAN recovery catalog owner.
• D、 To perform most of the RMAN operations， the virtual catalog owner must have the SYSDBA or  SYSOPER privilege on the target database.