All of the following are examples of malicious code except a Cookies b Worms c Virus d Trojans?

Cookies are not considered malicious code; they are small data files stored on a user's device by websites to track user activity and preferences. In contrast, worms, viruses, and Trojans are all types of malicious code designed to harm systems, steal information, or disrupt operations. Therefore, cookies are the exception among the options listed.