Explanation:
Before the issuing the dbms_redefinition_start_redef table procedure call it’s recommended to invoke the dbms_redefinition.can_redef_table procedure and create an empty interim table with all the desired characteristics. Dbms_redefinition_start_redef procedure verifies that the table can be redefined online.
Incorrect Answers:
1: You don’t need to grant privileges on the interim table.
3: It is recommended to periodically synchronize the interim table with the source one when a large amount of DML is executed on the table while the re-organization is taking place by calling the dbms_redefinition.sync_interim_table() procedure. But this step is not required.
4: You don’t need to create any triggers, indexes, or constraints on the interim table.
Reference:
OCP Oracle9i Database: New Features for Administrators, Daniel Benjamin, p. 78-80
Chapter 2: Availability Enhancements
Oracle 9i New Features, Robert Freeman, p. 46-53
Chapter 2: Oracle9i Architecture Changes

---