Correct option is C
Knurling is a machining process performed on a lathe to create a textured pattern on the surface of a workpiece. Knurling does not involve plastic deformation of metal and is instead a finishing or marking process.
The other options- Rolling, Extrusion, and Forging are metal-forming processes. Rolling: Reduces thickness or changes the cross-section of metal by compressive forces.
Extrusion: Pushes material through a die to create objects with fixed cross-sectional profiles.
Forging: Shapes metal using compressive forces, often at high temperatures.
