a$)$ These results tend to indicate that the hacker community has, with rare exception, failed to produce highly metamorphic malware. Why do you suppose this is the case?

b$)$ It might seem somewhat surprising that the highly metamorphic NGVCK viruses can be detected. Provide a plausible explanation as to why these viruses can be detected.

c$)$ Is it possible to produce undetectable metamorphic viruses? If so$,$ how? If not, why not?