Which three statements are true about using an invisible column in the PRODUCTS table?

Examine the following command: Which three statements are true about using an invisible
column in the PRODUCTS table?

A.
The DESCRIBE commands in SQL *Plus will not display the invisible column in the
output.

B.
A primary key constraint can be added on the invisible column.

C.
The %ROWTYPE attribute declarations in PL/SQL to access a row will not display the
invisible column in the output.

D.
The invisible column cannot be made visible and can only be marked as unused.

E.
Referential integrity constraint cannot be set on the invisible column.