（多选题）
Which two statements are true regarding views?（）
AA subquery that defines a view cannot include the GROUP BY clause
BA view that is created with the subquery having the DISTINCT keyword can be updated
CA view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updated
DA 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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