Consider the following statements regarding the behavior of dislocations:
1. Only edge dislocation and mixed dislocation can have glide motion.
2. A screw dislocation cannot have glide motion.
3. Dislocation moves in the direction perpendicular to that of shear stress.
4. Motion of dislocation occurs on slip plane that contains Burger's vector and direction vector. Which of the above statements are correct?
(a) 1, 2 and 3 only (b) 1, 2 and 4 only
(c) 2, 3 and 4 only (d) 1, 2, 3 and 4