All of the Following Are Benefits and Insights Provided by Mystery

All of the following are benefits and insights provided by mystery shopping EXCEPT:

A) identifying differences in the customer experience across different times of day,location,product/service types,and other potential sources of variation in the product/service quality
B) enabling marketers to examine the gap between promises made through advertising/sales promotion and actual service delivery
C) enabling an organization to monitor compliance with product/service delivery standards and specifications
D) understanding the most profitable means of marketing a product or service
E) helping monitor the impact of training and performance improvement initiatives