VEHICLE INFO vehicle code char(7) year char(4) make varchar(15) model varchar(15) trim line varchar(4) date model introduced date msrp smallmoney The above shown table named VEHICLE INFO already exists along with all of the columns shown. Which of the following SQL will correctly make the column vehicle code a primary key ALTER TABLE [VEHICLE INFO] PRIMARY KEY( [vehicle code]) ALTER TABLE (VEHICLE INFO] ADD CONSTRAINT PK_VEHICLE UNIQUE ( [vehicle code]) i ALTER TABLE (VEHICLE INFO] CREATE CONSTRAINT PRIMARY KEY ( [vehicle code])