Users are complaining that they are receiving spam from the email account that belongs to a co-worker. What could cause this problem?

Question:
Users are complaining that they are receiving spam from the email account that belongs to a co-worker. What could cause this problem?

• A virus has damaged the master boot record on the system that is used by the co-worker.
• The network adapter on the computer that is used by the co-worker is malfunctioning.
• The email account belonging to the co-worker was hijacked because of malware.
• The email client belonging to the co-worker is not configured properly.

Exam with this question: IT Essentials (ITE v7) Chapter 12 Exam Answers