Question: Add a check constraint to the Appointments table. Ensure that the INVOICE is greater than or equal to 0. Select the correct SQL. a. MODIFY

Add a check constraint to the Appointments table. Ensure that the INVOICE is greater than or equal to 0. Select the correct SQL. a. MODIFY Appointments CONSTRAINT INVOICE > 0; b. ALTER TABLE Appointments ADD CHECK (INVOICE>0); c. ALTER TABLE Appointments ADD CHECK (INVOICE >=0)

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