The company you are working for has found that their networked computers have started to run much more slowly than they used to. a. As the only employee with a technical background, the manager of the company has asked you if it is possible that this has been caused by a computer virus despite the computers having anti-virus software. What do you tell him and why? b. Your manager wants to install a different piece of anti-virus software on the computers to get rid of this problem. Explain why this approach might not work.