In metal machining, the work-tool contact zone is a zone where heat is generated due to

Option c is correct.kindly rectify it

In metal machining, the heat generated in the work-tool contact zone is primarily due to C. Friction between the moving chip and the tool face. As the chip slides along the tool face, there is significant friction between the two surfaces, leading to the generation of heat. This frictional heat can influence various aspects of the machining process, including tool wear, material deformation, and the temperature of the workpiece and cutting tool.

The primary purpose of burnishing is not material removal, like in machining or grinding, but rather to plasticize the surface layer of the workpiece, causing it to flow and fill in any gaps or irregularities. This results in a smoother and shinier surface with improved hardness and resistance to wear.