BZYX COMPANY Observe the ER diagram for the BZYX COMPANY: This ER diagram will be used for the following questions citing BZYX Company ER Diagram. Which of the following is true according to the BZYX Company ER diagram? An employee can serve many customers and he or she has to serve at least one customer An employee can serve one customer or he or she does not have to serve any customers Each employee serves exactly one customer Employees do not serve customers None if the above