Which two statements are true about tablespaces? (Choose two.)
A. A database instance stores undo data in the SYSTEM tablespace if no undo tablespace exists
B. A database instance hangs if the SYSAUX tablespace becomes unavailable
C. A database with a locally managed SYSTEM tablespace can have dictionary-managed user tablespaces
D. A database can contain multiple undo tablespaces
E. A database can contain only a single temporary tablespace