Application of traction may be beneficial to..
a. relieve muscle spasms.
b. hold a fracture in the correct position.
c. separate bone fragment ends.
d. all of the above.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave

occluded front i think