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Which three are true about dropping columns from a table?

Which three are true about dropping columns from a table?

A.

A column can be removed only if it contains no data.

B.

A column drop is implicitly committed

C.

A column that is referenced by another column in any other table cannot be dropped.

D.

A column must be set as unused before it is dropped from a table.

E.

A primary key column cannot be dropped.

F.

Multiple columns can be dropped simultaneously using the ALTER TABLE command.

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