Which classification of “impossible” is appropriate in this discussion?

Obligation Beyond Capacity: Possibility, Ability, and Moral Judgment

• Intrinsic impossibility, legal prohibition, and merely unlikely behavior
• Intrinsic impossibility, an unissued command, and an abrogated command
• Intrinsically contradictory, beyond human ability, and excluded by foreknowledge
• Treating incapacity, noncompliance, and lack of intention as one category