You plan to take a closed database backup using operating system commands. Which three SHUTDOWN options are appropriate for this type of backup？（）

A.SET
B.ALTER
C.CHANGE
D.UPDATE

A.Stripes a single backup set across multiple channels.
B.Identical copies of backup pieces within a backup set.
C.Multiple backup sets with multiple channels configured.
D.Simultaneous reads from multiple files and writes into the same backup piece.

A.Data encryption.
B.User authentication.
C.Transparent data conversion
D.Configuration and administration mechanisms.
E.Support for multiple network transport protocols.