What Is the Most Important Prerequisite for Weaning a Patient

What is the most important prerequisite for weaning a patient from ventilatory support?

A) Improvement in the original problem requiring mechanical ventilation
B) Assurance that the patient's ventilatory demand exceeds the patient's capacity
C) Objective evidence indicating good respiratory muscle endurance
D) Ability to maintain adequate oxygenation with an FiO₂ less than 0.4

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