15 abd 16 plz

15. Which of the following would be least likely to be represented with a Unified Modeling Language (UML) Class? A. Trucks B. The number of trucks used in the delivery c. The employee driving the truck D. The customer receiving the delivery 16. Which of the following statements about foreign keys is not true? A. A foreign key can be a combination of attributes B. A foreign key cannot be NULL c. Foreign key must match values of the linked primary key D. Foreign keys support a defined association