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The term "Radiological Dispersal Device (RDD)" specifically refers to a device designed to disperse radioactive materials, typically to cause harm through contamination rather than an immediate explosive effect. RDDs, often referred to as "dirty bombs," utilize conventional explosives to spread radiological materials over a wide area, posing health risks through radiation exposure and contamination. This definition captures the essence and function of the device, distinguishing it clearly from other options.

For instance, a nuclear bomb is designed for a different purpose, primarily to cause massive destruction through nuclear fission or fusion. A conventional explosive device typically refers to non-radiological explosives like dynamite or grenades that do not involve dispersing radioactive materials. A smart delivery system generally pertains to advanced technology used to deliver payloads accurately but does not specifically relate to radiological materials. These distinctions highlight why the category of "Radiological Dispersal Device (RDD)" is the appropriate and specific answer for the question posed.