You CANNOT change a file's file extension

A black-and-white effect, achieved through a series of shades of gray from white to black, is called ________

Fill in the blank(s) with correct word

Which of the following rules can drastically reduce the odds of a machine becoming infected with a virus?

A) If you are unsure about an attachment, do not open it. B) Always use a virus scanner. C) Don’t believe “security alerts” that are sent to you. D) All of the above