E & E Inc. used the slogan "We guarantee prompt customer service." The business had recently doubled its number of customers. The staff of the customer service department is constantly busy, and they cannot keep up with customer demand. The problem is that
a. The customer service department is not effective
b. The slogan does not accurately reflect the company's capabilities
c. The business should not have increased its customer base
d. Doubling the number of customers was a mistake