Lecturer: Given our current state of knowledge and technology, we can say that the generalization that the entropy of a closed system cannot decrease for any spontaneous process has not been falsified by any of our tests of that generalization. So we conclude it to be true universally. Yet, it must be admitted that this generalization has not been conclusively verified, in the sense that it has not been tested in every corner of the universe, under every feasible condition. Nevertheless, this generalization is correctly regarded as a scientific law; indeed, it is referred to as the Second Law of Thermodynamics. Which one of the following principles, if valid, most justifies the lecturer's classification of the generalization described above? ['If a generalization is confirmed to the extent current science allows, then it is considered a scientific law.', 'If a generalization is confirmed only under a few circumstances, it should not be considered a scientific law.', 'Whatever is regarded as a scientific law will eventually be conclusively verified.', 'Whatever is true universally will eventually be confirmed to the extent current science allows.']