Which three statements are true regarding the use of the Database Migration Assistant for Unicode (DMU)?

Which three statements are true regarding the use of the Database Migration Assistant for
Unicode (DMU)?

A.
The database to be migrated must be opened read-only.

B.
The release of the database to be converted can be any release since 9.2.0.8.

C.
The DMU can report columns that are too long in the converted characterset.

D.
The DMU can report columns that are not represented in the converted characterset.

E.
A DBA can check specific tables with the DMU