Joe, a User, Believes His Computer Is Infected with Malware

Multiple Choice

Joe, a user, believes his computer is infected with malware. The device is having difficulty accessing some websites, and web services are not responding from any of the web browsers, although Joe can access these services from his smartphone without issue. The computer's malware scanner has the latest definitions installed. Which of the following would BEST explain why the computer is functioning this way?

A) Expired root certificate
B) OS update failures
C) Pop-up blocker
D) Hijacked email