Which of the following statements about computer malware software are correct?

A. Viruses can self-replicate and spread to other programs and files without user interaction.

B. Worms are a type of malware that spread over networks by exploiting vulnerabilities without the need for a host file.

C. Spyware monitors user activities and can collect personal information without the user’s knowledge.

D. Ransomware is a software designed to optimize a computer’s performance.

Choose the most appropriate answer from the options given below: