Which type of virus changes its code order each time it replicates to another machine?

The correct choice is polymorphic because a polymorphic virus is designed to alter its code each time it replicates. This mechanism makes it difficult for antivirus software to detect and eliminate it, as the signature of the virus changes with every iteration. Polymorphic viruses accomplish this through various techniques, such as changing the order of their code instructions, obfuscating their underlying structure, or encrypting their payload, which allows them to evade detection while maintaining the same functionality.

Understanding the nature of polymorphic viruses is crucial, as their adaptive characteristics highlight the significance of employing advanced detection and prevention strategies in cybersecurity to combat evolving threats. This adaptability emphasizes the need for security professionals to stay informed about the ever-changing landscape of malware and to utilize updated tools and techniques to protect systems effectively.