题目：
选择题
Why does the author give the example of Bliss? __________
- A. To argue that the Bliss virus only remains chiefly a research curiosity.
- B. To argue that other operating systems may run viruses, not just Windows.
- C. To argue that the Bliss virus has characteristic of viruses as opposed to worms.
- D. To argue that the Bliss virus could be harmless even if user ran it on Unix.
答案：
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