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The correct answer is bituminous coatings, which are historically significant as original coatings used in Europe. These coatings have been widely employed for their protective qualities, primarily due to their resistance to corrosion and ability to provide a waterproof barrier. Bituminous coatings are made from natural or synthetic asphalts, making them suitable for various applications, especially in environments exposed to moisture and harsh chemicals.

In the context of cathodic protection and corrosion mitigation, understanding the origins and properties of different coating types is crucial. Bituminous coatings have long been utilized in pipeline and metal structure protection, particularly in Europe, due to their proven effectiveness over many decades. This historical use and their properties make them a key reference point when discussing original coatings.

Other options, while they are relevant in the modern context of protective coatings, did not gain the same historical traction as bituminous coatings in Europe. For instance, epoxy and polyurethane coatings are more contemporary developments that offer specific performance attributes, but they are not classified as original coatings from Europe. As for extruded polyolefin systems, they are specialized materials developed for unique applications and are not recognized as traditional coatings used in early protective systems. Therefore, bituminous coatings remain the correct choice for this question based on their historical significance and original usage