Groupon recognizes that talking to customers, building relationships, and maintaining those relationships are challenging and stressful but keys to the success of the business. groupon employs a 300 person customer service department in chicago and 700 additional customer service employees across the world. this is a big commitment and sends the clear message groupon is managing customer service stress through: a. self service technologyb. personal relationships c. off shore call centersd. all of the above