One should always capitalize the main words and the first and last words of a title. But one should never capitalize articles, or prepositions and conjunctions with fewer than five letters, when they occur in the middle of a title. Which one of the following can be properly inferred from the statements above? ['If a word that is a preposition or conjunction should be capitalized, then it is the first or last word of the title.', 'Prepositions and conjunctions with five or more letters should be capitalized in any text.', 'If a word in the middle of a title should be capitalized, then that word is neither an article nor a conjunction shorter than five letters.', 'If a word is neither a main word nor a first or last word of a title, then it should not be capitalized.']