A US case involving malicious code is brought to trial. An employee had opened a helpdesk ticket to report specific inst

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A US case involving malicious code is brought to trial. An employee had opened a helpdesk ticket to report specific instances of strange behavior on her system.
The IT helpdesk representative collected information by interviewing the user and escalated the ticket to the system administrators. As the user had regulated and sensitive data on her computer, the system administrators had the hard drive sent to the company's forensic consultant for analysis and configured a new hard drive for the user. Based on the recommendations from the forensic consultant and the company's legal department, the CEO decided to prosecute the author of the malicious code. During the court case, which of the following would be able to provide direct evidence?

A. The IT helpdesk representative
B. The company CEO
C. The user of the infected system
D. The system administrator who removed the hard drive