Explanation:

- Option 1: Formulation of Jural Postulates

- Jural postulates are a legal theory proposed by Roscoe Pound. These are assumptions that a society must accept in order to maintain law and order.

- Option 2: Theory of Social Engineering

- This concept is also attributed to Roscoe Pound. It refers to the idea of using law to shape society, akin to engineering, to solve societal issues and improve social order.

- Option 3: Both (a) and (b)

- Both the formulation of jural postulates and the theory of social engineering are contributions by Roscoe Pound. He is renowned for his work in both domains, advancing the idea that laws should adapt to societal changes.

- Option 4: None of these

- This option is incorrect as it dismisses the contributions made by Pound in both theories.