Which of the following describes the ability for a third party to verify the sender or recipient of a given electronic message during authentication?

The ____ method returns the Boolean value True if the file exists; otherwise, it returns the Boolean value False.

A. IsThere B. CanFind C. DoesExist D. Exists

What does the following statement do?this.BackColor = System.Drawing.Color.Blue;

A. sets the form color to Blue B. sets whichever control you have selected to Blue C. sets all of the controls on the form to Blue D. sets the drawings on the form to Blue