You are the administrator of a SQL Server 2000 computer. The server contains a database named Inventory. Users report that several storage locations in the UnitsStored field contain negative numbers. You examine the database's table structure. The table properties are configured as shown in the exhibit.

You correct all the negative numbers in the table. You must prevent the database from storing negative numbers. You also want to minimize use of server resources and physical I/O.
Which transact-SQL statement should you execute？
A．ALTER TABLE dbo.storagelocations ADD CONSTRAINTS CK_storagelocations_UnitsStored CHECK （UnitsStored>= 0)
B．CREATE TRIGGER CK_UnitsStored On StorageLocations FOR INSERT, UPDATE AS IF INSERTED, UnitsStored < 0 ROLLBACK TRAN
C．CREATE TABLE ck_unitsstored As @Units >= 0 GO Sp_bindrule ‘OK_UnitsStored’, ‘StorageLocations, UnitsStored’ GO
D．CREATE PROC UpdateUnitsStored （StorageLocationID int, @UnitsStored bigint)AS IF @UnitsStored < 0 DATSERROR （50099, 17) ELSE UPDATE storaheLocations SET UnitsStored = @UnitsStored WHERE StorageLocationID = @storageLocationID