Which of the following types of techniques is commonly used by malware creators to shift the signature of malware to prevent detection by antivirus tools?

Polymorphism is the process of generating different versions of the same malware program with different code. This makes it difficult for antivirus tools to keep up with the latest versions of malware.
Here's how polymorphism works:
- The malware creator creates a base malware program.
- The malware creator uses a polymorphism engine to generate different versions of the base malware program.
- Each version of the malware program has a different code signature.
- The malware creator distributes the different versions of the malware program to different victims.
When an antivirus tool scans a victim's computer, it will only be able to detect the malware program that it has a signature for. If the malware program has a different code signature, the antivirus tool will not be able to detect it.