You administer a sql 2012 serve r that contains a database named salesdb. salesdb contains a schema named customers that has a table named regions. a user named usera is a member of a role named sales. usera is granted the select permission on the regions table. the sales role is grante d the select permission on the customers schema. you need to remove the select permission for usera on the regions table. you also need to ensure that usera can still access all the tables in the customers schema, including the regions table, through the sales role permissions. which transact-sql statement should you use?