You tie a battery-powered, fixed-frequency buzzer to the end of a string and swing it ar...

You tie a battery-powered, fixed-frequency buzzer to the end of a string and swing it around in a large horizontal circle as shown. Your friend stands well off to the right and listens to the tone. At which of the labeled locations will the buzzer be when your friend hears the highest frequency? (Assume that the time it takes the sound to travel from the buzzer to your friend’s ear can be ignored.)