Q139 Which two are true about shrinking a segment online?

Q139 Which two are true about shrinking a segment online? (Choose two.)

• (A). It is not possible to shrink either indexes or Index Organized Tables (IOTs)
• (B). It always eliminates all migrated rows if any exist in the table
• (C). To shrink a table it must have a PRIMARY KEY constraint
• (D). To shrink a table it must have a UNIQUE KEY constraint
• (E). To shrink a table it must have row movement enabled
• (F). It must be in a tablespace that uses Automatic Segment Space Management (ASSM)