While organ transplantation technology is becoming more mature, donor organs that can be used for transplantation are seriously inadequate, and xenogeneic organ transplantation is the most effective way to solve the shortage of donor organs. A researcher said that transgenic cloned pigs are expected to become donors for xenotransplantation in the future. In simple terms, what organs humans need to transplant in the future can be extracted from transgenic cloned pigs. More vividly, transgenic cloned pigs are equivalent to the "factory" of human organs. Which of the following, if true, would best support the above conclusion? ['In terms of genetic structure, monkeys and orangutans are more suitable for xenotransplantation than pigs, but they will face greater ethical difficulties.', 'The combination of cloned pig technology and transgenic technology can promote the rapid reproduction of top quality breeding pigs and the breeding of excellent new breeds.', 'Transgenic cloning technology can modify and transform pig genes to produce cloned pigs that basically do not contain "exclusion genes" and risk factors.', "transfer the genes of some important protein drugs into the pig's genome, and achieve gene expression in organs such as the breast of pigs, and extract valuable medicinal proteins from them."]