Two roommates both registered for an introduction to business class. at midterm, oneroommate found his instructor so boring that he was thinking of changing his major to history. the other roommate had a charismatic teacher and looked forward to going to class. this heterogeneity of instruction demonstrates:
a. how difficult it is to synchronize supply and demand with service
b. that customer service depends on employee actions
c. how customers affect each other
d. the fact services cannot be readily communicated or displayed
e. why services cannot be inventoried