oracle ocp 19c考题，科目082考试题(17)-using an invisible column

17. 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 t he 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 t he output.C. Referential integrity constraint cannot be set on t he 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 t he invisible column.source : cuug