With reference to the interior of the earth consider the following statements:
1) P-waves vibrate perpendicular to the direction of the wave.
2) The mean thickness of oceanic crust is 5 km.
3) S-waves can travel through solids, liquids and gaseous materials.
Which of the statements given above is / are correct?

A

1 and 3 only

B

2 only

C

2 and 3 only

D

1, 2 and 3