Which of the following waves can propagate in a vacuum ?1. Radio waves2. Light waves 3. X - rays4. Ultrasonic wavesSelect the correct answer using codes given belowCodes:

Which of the following waves can propagate in a vacuum ?1. Radio waves

1.	Which of the following waves can propagate in a vacuum ? 1. Radio waves 2. Light waves 3. X - rays 4. Ultrasonic waves Select the correct answer using codes given below Codes:
A.	1, 2 and 3
B.	1, 2, 3 and 4
C.	2, 3 and 4
D.	1 and 4
Answer» B. 1, 2, 3 and 4