Which one of the following materials is very hard and very ductile?

The question asks for a material that is both very hard and very ductile. 1. Carborundum (Silicon Carbide) is extremely hard but very brittle (not ductile). 2. Tungsten is very hard and has a high melting point, but it is generally brittle at room temperature, although it can be made ductile through processing. 3. Cast iron is hard but brittle due to its high carbon content. 4. Nichrome (an alloy, typically of Nickel and Chromium) is known for its high resistance, strength at high temperatures, and importantly, it is both reasonably hard and highly ductile, allowing it to be drawn into wires (used in heating elements). Among the given options, Nichrome best fits the description of being very hard and very ductile.