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Evaluate the following SQL statement:
ALTER TABLE hr.emp SET UNUSED (mgr_id);
Which statement is true regarding the effect of the above SQL statement?

Any synonym existing on the EMP table would have to be re-created.

Any constraints defined on the MGR_ID column would be removed by the above command.

Any views created on the EMP table that include the MGR_ID column would have to be dropped and re-created.

Any index created on the MGR_ID column would continue to exist until the DROP UNUSED COLUMNS command is executed.

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