Which of the Following Queries Is Used to List a Unique

Multiple Choice

Which of the following queries 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;