A department store surveyed 428 shoppers, and the following information was obtained: 214 shoppers made a purchase, and 299 were satisfied with the service they received. If 52 of those who made a purchase were not satisfied with the service, how many shoppers did the following?
a. made a purchase and were satisfied with the service
b. made a purchase or were satisfied with the service
c. were satisfied with the service but did not make a purchase
d. were not satisfied and did not make a purchase
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