Explanation:

- Austin: John Austin was a legal theorist known for his theory of legal positivism. He focused primarily on the nature of law and sovereignty, rather than corporate personality or institutional theory.

- Hauriou: Maurice Hauriou was a French legal scholar known for his work on administrative law and institutional theory, explaining how institutions function within society.

- Allen: C. K. Allen contributed to discussions on jurisprudence and corporate personality, particularly in terms of understanding corporations as legal entities.

- Friedmann: W. Friedmann was known for his work on the theory of law, especially regarding legal systems and their development, but not directly on corporate personality.

- Correct Answer: Option 2 - Hauriou