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Which two statements are true regarding multiple-row subqueries? (Choose two.)

A.
They can contain group functions.

B.
They always contain a subquery within a subquery.

C.
They use the < ALL operator to imply less than the maximum.

D.
They can be used to retrieve multiple rows from a single table only.

E.
They should not be used with the NOT IN operator in the main query if NULL is likely to be a part of the result of the subquery.

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