The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a DVD player made by the company over the past 12 months are satisfied with their products. The possible responses to the question "Are you happy, indifferent, or unhappy with the performance per dollar spent on the DVD player?" result in Select one: a. a nominal scale variable. b. an interval scale variable. c. a ratio scale variable. d. an ordinal scale variable.

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