At a cafeteria type restaurant. There are 5 or 6 people ahead of you and a bunch in line behind. The person in line behind you is a uniformed police officer. You are carrying your pistol on a belt holster at 5 o'clock and it's covered by an extra long shirt worn untucked. You notice the officer is looking sternly at you and asks "Are carrying a gun?". What is the proper response to his question?