According to the wave action theory for creep of rails, the pitch and depth of wave depend upon:1) Section of rails2) Track modulus3) Stiffness of track4) Stability of foundation5) Weight of the trainWhich of these are correct?

According to the wave action theory for creep of rails, the pitch and

1.	According to the wave action theory for creep of rails, the pitch and depth of wave depend upon:1) Section of rails2) Track modulus3) Stiffness of track4) Stability of foundation5) Weight of the trainWhich of these are correct?
A.	1 and 2 only
B.	1, 2 and 3
C.	2, 3 and 4
D.	3, 4 and 5
Answer» D. 3, 4 and 5