The Nehru-Mahalanobis model of development strategy, implemented by India in the mid-20th century, focused on state-led industrialization and economic planning to promote growth and development. It has several key features:

1. Development of capital goods industries: Option 1 is a feature of the Nehru-Mahalanobis model. It emphasized the need for the development of industries that produce capital goods, such as machinery and equipment, to support the growth of other sectors of the economy.

2. Major involvement of the State in the economy: Option 2 is also a feature of the Nehru-Mahalanobis model. It advocated for a strong role of the state in guiding and directing economic development through centralized planning, public sector enterprises, and regulations.

3. Industrial deregulation and disinvestment in the public sector: Option 3 is not a feature of the Nehru-Mahalanobis model. In contrast, the model emphasized the importance of the public sector in driving industrialization and economic development. It promoted public ownership and control of key industries to ensure national self-sufficiency and equitable development.

4. Enhancing the scope and importance of the public sector: Option 4 is a feature of the Nehru-Mahalanobis model