Symptoms of computer virus attack include:
I improved processing speeds; Il drive light coming up without apparent reason; Ill unexplainable printer activity; IV the disappearance or strange files appearance on the screen
The correct answer is: C
Explanation
Symptoms of a computer virus attack often include drive light coming up without apparent reason, unexplainable printer activity, and file disappearance or strange files appearing on-screen. Improved processing speed is not a typical symptom of a virus attack, a virus usually slows down the computer.