Which of the following commands will add a UNIQUE constraint to the MINRETAIL column of the PROMOTION table?
a. ALTER TABLE promotionADD CONSTRAINT orderitems_minretail_uk UNIQUE (minretail);
b. ALTER TABLE promotionMODIFY UNIQUE (minretail);
c. ALTER TABLE promotionADD UNIQUE minretail;
d. ALTER TABLE promotionMODIFY minretail;
a
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