Characteristics of Encrypted Viruses

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Q: Cryptographic techniques are utilized by encrypted viruses to prevent detection. Which of the below statements accurately describes encrypted viruses and their characteristics?

Answer is complete. Select more than one answer if applicable.

a. They will shield clients from DNS cache poisoning.

b. They allow DNS servers to transfer records away from the master server.

c. In outward appearance, they are very similar to polymorphic viruses.

d. Each infected machine will have a virus with a distinct signature.

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