In advanced English syntax and discourse representation, the conversion of direct speech into indirect speech involves intricate shifts in tense backshift, pronominal deixis, adverbial modification, and mood transformation—particularly when handling interrogatives, imperatives, exclamatories, and mixed speech acts. Consider the following four advanced propositions regarding direct and indirect narration: I. When converting a direct interrogative sentence beginning with a Wh- word (e.g., *He asked her, "Where are you going for your sabbatical?"*) into indirect speech, the interrogative word functions as the subordinator, the inverted subject-verb word order of the direct question must be inverted back to standard declarative word order, and a question mark is retained at the closure of the reported clause. II. When reporting an imperative sentence that expresses a polite request or advice with a vocative address (e.g., *The supervisor said to the junior researcher, "Please review this draft by tomorrow morning"*), the reporting verb is typically converted to 'requested' or 'advised', the imperative mood is transformed into a to-infinitive complement clause, and temporal-deictic markers such as 'tomorrow' shift to 'the following day' or 'the next day'. III. When the reporting verb is cast in a present or future tense (e.g., *She says* or *She will say*), the tense of the verbs within the reported clause undergoes strict backshifting (e.g., simple present shifting to simple past, and present continuous to past continuous) to maintain chronological distance from the utterance moment. IV. When reporting an exclamatory sentence that conveys sudden emotion or an evaluative exclamation (e.g., *He exclaimed, "What a catastrophic failure the project has been!"*), the structure is converted into a declarative statement by employing an appropriate reporting verb of exclamation (e.g., 'exclaimed with sorrow' or 'cried out'), removing the exclamatory markers, and introducing intensifiers such as 'great' or 'very' to reflect the degree of the original adjective or noun phrase. Identify the option that correctly evaluates the grammatical, syntactic, and structural validity of propositions I, II, III, and IV according to standard English grammar and indirect speech transformation rules.