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.
A DBA can check specific tables with the DMU

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

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

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

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

Explanation:
A: In certain situations, you may want to exclude selected columns or tables from scanning
or conversion steps of the migration process.
D: Exceed column limit
The cell data will not fit into a column after conversion.
E: Need conversion
The cell data needs to be converted, because its binary representation in the target
character set is different than the representation in the current character set, but neither
length limit issues nor invalid representation issues have been found.