Which Query Is Used to List a Unique Value for V_CODE

Multiple Choice

Which query is used to list a unique value for V_CODE, where the list will produce only a list of those values that are different from one another?

A) SELECT ONLY V_CODE
FROM PRODUCT;
B) SELECT UNIQUE V_CODE
FROM PRODUCT;
C) SELECT DIFFERENT V_CODE
FROM PRODUCT;
D) SELECT DISTINCT V_CODE
FROM PRODUCT;