Explanation:

Correct option 1: Analytical School        

The Analytical School of jurisprudence, led by thinkers like John Austin, holds that custom is not law until it is recognized and enforced by the sovereign authority. According to this view, customs are merely sources from which laws may originate, but they do not have the status of law unless they are codified or sanctioned by the state.

In contrast:

• The Historical School (e.g., Savigny) views custom as law in itself, evolving naturally over time.

• The Sociological School focuses on law's social purposes.

• The Realist School emphasizes what judges actually do, not what laws say.