SONAR, which stands for Sound Navigation and Ranging, is a device used by ships to measure the distance of underwater objects. It works by emitting sound waves into the water and then detecting the echoes that bounce back off objects. These echoes are used to determine the distance and location of the objects.

Option 1: Infrasonic waves are sound waves with frequencies below the audible range for humans. Since SONAR uses sound waves that are audible to humans, it does not use infrasonic waves.

Option 2: SONAR does use sound waves, but they are not limited to the audible range for human beings. In fact, SONAR typically uses ultrasonic waves, which have frequencies above the audible range for humans.

Option 3: Ultrasonic waves are sound waves with frequencies above the audible range for humans. This is the correct answer as SONAR uses ultrasonic waves to measure the distance of underwater objects.

Option 4: This option is incorrect because SONAR does not use infrasonic waves or sound waves in the audible range for human beings. Therefore, option 4 is not the correct answer.

In conclusion, the correct answer is option 3 as SONAR uses ultrasonic waves to measure the distance of underwater objects.