In what way are zombies used in security attacks?

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In what way are zombies used in security attacks?

They target specific individuals to gain corporate or personal information.
They probe a group of machines for open ports to learn which services are running.
They are maliciously formed code segments used to replace legitimate applications.
They are infected machines that carry out a DDoS attack.

Explanation: Zombies are infected computers that make up a botnet. The zombies are used to deploy a distributed denial of service (DDoS) attack.