Which of the following statements are true about worms?

Which of the following statements are true about worms?

Each correct answer represents a complete solution. Choose all that apply.
A . Worms can exist inside files such as Word or Excel documents.
B . Worms cause harm to the network by consuming bandwidth, whereas viruses almost always corrupt or modify files on a targeted computer.
C . One feature of worms is keystroke logging.
D . Worms replicate themselves from one system to another without using a host file.

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Answer: A,B,D