A reading service for the visually impaired requires each reader applicant to prepare and submit a one-hour interview tape of material chosen by the service to determine whether the reader has pleasing vocal characteristics and is accent free so that it is not necessary to use the same reader every time. The reading service is trying to limit problems associated with the service characteristic of:
a. tangibility.
b. credence quality.
c. heterogeneity.
d. simultaneous production and consumption.
e. flexibility.
ANSWER: c