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Baako is preparing a questionnaire that will be used with patients at a local hospital. The questionnaire largely focuses on rating the quality of care provided and the professionalism of the staff. He is concerned that the respondents might stick to a particular pattern of response. Which strategy should Baako use to prevent this from happening?
a. Using two different items opposite in meaning
b. Validating the instrument
c. Performing a pilot study
d. Properly training the research staff