Which of the following prevent DML operations like INSERT, UPDATE and DELETE on a view?

Which of the following prevent DML operations like INSERT, UPDATE and DELETE on a view?
Each correct answer represents a complete solution. Choose all that apply.

A.
The use of the GROUP BY clause.

B.
The use of the DISTINCT keyword.

C.
The use of the SQL Group Functions.

D.
The use of the ROWNUM pseudo column.