Examine the following command： SQL> ALTER TABLE booking SHRINK SPACE COMPACT； Which activity is performed when the preceding command is executed？（）
- A The shrink operation touches every block in the BOOKING table
- B The high-water mark （HWM） for the BOOKING table is shifted from its original position
- C The progress of the shrink operation is saved in the bitmap blocks of the BOOKING table
- D The data manipulation language （DML） triggers on the BOOKING table are executed because the shrink operation is internally handled by the INSERT/DELETE operatio