In advanced English morphosyntax and determiner classification, the distribution of articles and quantifiers depends heavily on noun countability, generic reference, and idiomatic constraints. Consider the following four advanced propositions regarding articles and determiners:I. When referring to a class or species generically in formal English, both the singular countable noun preceded by the definite article (e.g., 'The tiger is an endangered species') and the plural countable noun with the zero article (e.g., 'Tigers are endangered species') are syntactically and semantically acceptable.II. The indefinite article 'an' is required before initial acronyms or abbreviations whose pronunciation begins with a vowel sound (e.g., 'an MP', 'an FBI agent'), whereas initialisms starting with a consonant sound take 'a' (e.g., 'a UN resolution'), regardless of how the full spelled-out phrase sounds.III. Post-determiners such as cardinal numerals, ordinal numerals, and quantifiers like 'few', 'little', 'many', and 'several' must invariably precede central determiners (such as articles and demonstratives) within the noun phrase hierarchy.IV. In coordinate structures where two distinct referents are denoted by singular countable nouns sharing a single article, the definite article must be repeated before each noun to indicate separate entities (e.g., 'The director and the producer has arrived' versus 'The director and producer have arrived').Identify the option that correctly evaluates the grammatical and syntactic validity of propositions I, II, III, and IV according to standard English grammar and article and determiner theory.