Examine the following command: CREATE TABLE (prod_id number(4), Prod_name varchar2 (20), Category_id number(30), Quantity_on_hand number (3) INVISIBLE); Which three statements are true about using an invisible column in the PRODUCTS table?（）
- A The %ROWTYPE attribute declarations in PL/SQL to access a row will not display the invisible column in the output.
- B The DESCRIBE commands in SQL *Plus will not display the invisible column in the output.
- C Referential integrity constraint cannot be set on the invisible column.
- D The invisible column cannot be made visible and can only be marked as unused.
- E A primary key constraint can be added on the invisible column.