QUESTION $22$

Which option above likely means Zero or one; the $"1"$ side is optional.

B

D

C

A

$$IFCTION $22$

Which of the following is true about the diagram:

a$.$ Each professor can be the dean of many schools

b$.$ A department can belong to many schools

c$.$ A professor is not required to be the dean of any school

d$.$ A professor is required to be the dean of at least one school