Based on the information given, both Technician A and Technician B are correct.
Technician A is correct in saying that a sanding stick can be used to block sand a high crown when used on its edge. A sanding stick is a long, narrow sanding tool that can be used to sand difficult-to-reach areas or to achieve a precise, even finish on a surface. When used on its edge, a sanding stick can be used to sand high crowns or other raised areas because it can be angled to match the contour of the surface.
Technician B is also correct in saying that a soft pad conforms to any contour. A soft pad is a type of sanding pad that is made of a flexible, sponge-like material. Because it is flexible, a soft pad can conform to any contour or shape, making it useful for sanding irregular surfaces or for achieving a smooth finish on contoured surfaces.
Therefore, both Technician A and Technician B are correct, and the correct answer is option (C) "Both A and B."