Which two statements are true about the migration of BasicFile to the SecureFile format by using the DBMS_REDEFINITION package?

Which two statements are true about the migration of BasicFile to the SecureFile format by using
the DBMS_REDEFINITION package? (Choose two.)

A.
It can be performed only on tables with a single LOB column.

B.
It automatically creates an interim table during the migration process.

C.
It allows the table that is migrated to be accessed throughout the migration process.

D.
It requires free space that is at least equal to the space used by the table that is migrated.

E.
It requires all constraints defined on the original table to be re-created manually after the
migration.