单选题 Why does the author give the example of Bliss? __________ 的答案

To argue that the Bliss virus only remains chiefly a research curiosity.

To argue that other operating systems may run viruses, not just Windows.

To argue that the Bliss virus has characteristic of viruses as opposed to worms.

To argue that the Bliss virus could be harmless even if user ran it on Unix.