The technique, Sonar uses
1.Ultrasonic waves
2.Radio waves
3.Infrasonic waves
4.Audible sound waves
Choose the correct answer by using the codes:



[ A ]    1, 2, 3 and 4
[ B ]    1 and 4 right
[ C ]    1, 2 and 4
[ D ]    2 and 3
Answer : Option B
Explanation :