A primary difference between quantitative measuresWhat can be said about mail surveys in comparison with online surveys? a. Online surveys would always be preferable to mail surveys. b. Mail surveys would always be preferable to online surveys. c. Choosing between mail and online surveys should depend on the population being surveyed and the feasibility of either approach. d. Choosing between mail and online surveys should depend only on the feasibility of either approach and qualitative measures is a. quantitative measures tend to use more open-ended questions and qualitative measures use more closed-ended questions. b. qualitative measures tend to use more open-ended questions and quantitative measures use more closed-ended questions. c. quantitative measures are usually unstructured and qualitative measures are usually highly structured. d. qualitative measures usually rely on surveys and quantitative measures usually rely on interviews