If the constraints on the ORDER# and ITEM# columns of the ORDERITEMS table were created as a PRIMARY constraint, and the actual constraint name is not known, which of the following commands can be used to delete the constraint?

a. ALTER TABLE orderitemsDROP ALL CONSTRAINTS;
b. ALTER TABLE orderitemsDELETE ALL CONSTRAINTS;
c. ALTER TABLE orderitemsDROP PRIMARY KEY;
d. ALTER TABLE orderitemsDELETE PRIMARY KEY;


c

Business

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