Ari has worked hard and developed a hi$-$tech company that is growing by leaps and bounds. Ari is buying himself a brand$-$new, high$-$priced Ferrari and certainly has a right to have high expectations in terms of performance and service. Compare Ari's situation to that of Paul who is buying a used car with high mileage for his $15-$year$-$old kid to learn how to drive. Paul does not expect the car to last long term. This example shows that $\_\_\_\_\_\_\_.$

a$.$ motivating factors show that the company is going above and beyond customer expectations, thereby enhancing customer satisfaction

b$.$ a zone of tolerance is a range of performance that would be acceptable to the customer

c$.$ most customers have an average predicted level of quality as their expectation marker

d$.$ value is defined as the trade$-$off of the quality of the purchase received compared to the price paid and other costs incurred