Please answer 16-21

16. The BPMN specification A. The Object Oriented Group 8. The Object Management Group C. The BPMN Management Group D. Boston Consulting Group 17. Which of the following BPMN shapes represents an Error Event? A. B. C. D. A. A group of classes B. The lines in a UML Class diagram C. The relationship between two classes D. The number of times one class is related to another Which of the following best describes the purpose of a primary key? A. 19. Allows linking two or more tables Indicates the minimum multiplicities for an association B. C. D. Matches values of foreign keys in other classes Uniquely identifies each instance of the class 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 20. 21. Which of the following is not a criterion for selection of a primary key? A. B. C. D. The primary key cannot be NULL (blank) The primary key should be controlled by the organization assigning it Primary keys with sequential values make it easier to spot gaps in the data Longer key values are better than shorter key values