Preference

Question: Which of the following sentence is correct?

  1. a.
    Another big question is what exactly Alibaba's Big Data Strategy?
  2. b.
    Another big question is what exactly is Alibaba's Big Data Strategy?
  3. c.
    Another big question what exactly is Alibaba's Big Data Strategy?
  4. d.
    Another big question is what is exactly Alibaba's Big Data Strategy?
Answer: b
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