In advanced English tense-aspect morphology, temporal framing, and subordinate clause constraints, precise tense selection is crucial for expressing complex time relations, habitual actions, and hypothetical scenarios. Consider the following four advanced propositions regarding tenses and their correct usage: I. When a temporal or conditional subordinate clause introduced by conjunctions such as 'when', 'before', 'after', 'until', or 'if' refers to a future event or state of affairs, standard English grammar strictly mandates the use of the present simple (or present perfect) tense rather than a modal auxiliary like 'will' or 'shall' (e.g., 'Please notify me as soon as the research report arrives', not '...as soon as the research report will arrive'). II. When describing an action that began in the past and continues uninterrupted up to the present moment, standard English requires the present perfect continuous tense combined with a duration adverbial introduced by 'since' or 'for' (e.g., 'The laboratory team has been analyzing the anomalous seismic data for over six hours'), rendering the simple past tense ungrammatical in this aspectual context. III. In historical present narratives used to recount past events vividly in literary discourse, shifting dynamically between past tense forms and present tense forms is syntactically prohibited within the same independent clause, though mixing them across distinct coordinate clauses is permitted. IV. In unreal conditional sentences of the past counterfactual type (third conditional), the protasis (if-clause) must employ the past perfect subjunctive, while the apodosis (main clause) utilizes the modal past combined with the perfect infinitive (e.g., 'If the financial audit had identified the discrepancies earlier, the corporation would have averted bankruptcy'). Identify the option that correctly evaluates the grammatical, syntactic, and semantic validity of propositions I, II, III, and IV according to standard English grammar and Grammatical tense principles.