Which two statements are true regarding views?（）
A subquery that defines a view cannot include the GROUP BY clause
B. A view that is created with the subquery having the DISTINCT keyword can be updated
C. A view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updated
D. A data manipulation language (DML) operation can be performed on a view that is created with the subquery having all the NOT NULL columns of a table
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