Which three statements about subqueries are true? （）
- A、Asinglerowsubquerycanretrieveonlyonecolumnandonerow.
- B、Asinglerowsubquerycanretrieveonlyonerowbutmanycolumns.
- C、Amultiplerowsubquerycanretrievemultiplerowsandmultiplecolumns.
- D、Amultiplerowsubquerycanbecomparedusingthe"；>；"；operator.
- E、AsinglerowsubquerycanusetheINoperator.
- F、Amultiplerowsubquerycanusethe"；="；operator.
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