Which two statements must be true for a successful onli…

Examine this command and output:

You want to relocate this database online to node 016n2.
Which two statements must be true for a successful online migration? (Choose two.)

A.
The database must be stored on shared storage.

B.
The database must have at least two UNDO tablespaces.

C.
The database must have at least two redo threads defined by the DBA.

D.
Database clients must disconnect before the online relocation timeout expires.

E.
Database clients must use Transaction Guard to prevent them from losing their connection.

F.
The database must be open.