Which of the following is not an example of malicious code?

1) Viruses

2) Worms
3) Encryption algorithms
4) Trojans

The correct answer is 3) Encryption algorithms. Encryption algorithms are not inherently malicious; they are tools used to secure and protect data.

To determine which of the following is not an example of malicious code, we would first need to know the options you are referring to. Please provide the options, and I will be able to guide you further.