ZYX COMPANY
Observe the ER diagram for the ZYX COMPANY:

This ER diagram will be used for the following questions citing ZYX Company ER Diagram.
-Which of the following is true according to the ZYX Company ER diagram?
A)A customer cannot be referred by another customer
B)A customer can be referred by at most one customer
C)A customer can be referred by many customers
D)A customer must be referred by another customer

Question

ZYX COMPANY
Observe the ER diagram for the ZYX COMPANY:
 
This ER diagram will be used for the following questions citing ZYX Company ER Diagram.
-Which of the following is true according to the ZYX Company ER diagram?
A)A customer cannot be referred by another customer 
B)A customer can be referred by at most one customer 
C)A customer can be referred by many customers 
D)A customer must be referred by another customer

Quizplus · Accepted Answer

According to the ER diagram, the "Refer" relationship between the "Customer" entity and itself has a "1 to 0 or 1" cardinality. This means that a customer can be referred by at most one other customer, but is not required to have a referring customer. Therefore, option B is the correct choice. Option A and D are incorrect because they state that a customer cannot or must be referred by another customer, respectively, which is not supported by the ER diagram. Option C is also incorrect because it suggests that a customer can be referred by many customers, which is not supported by the "1 to 0 or 1" cardinality.

ZYX COMPANY Observe the ER Diagram for the ZYX COMPANY