简述人生礼仪民俗的分类。

A. 2
B. 4
C. 6
D. 8

A. 正确
B. 错误

A. The PDB must be open in read-only mode.
B. The PDB must be in mount state.
C. The PDB must be unplugged.
D. The PDB data files are always removed from disk.
E. A dropped PDB can never be plugged back into a multitenant container database (CDB).