Within the Tertiary (Services) Sector, the sub-segment comprising **Financial, Real Estate, and Professional Services** is consistently the largest contributor to India's GDP. This segment reflects the high value-added activities of banking, insurance, IT services, and corporate real estate, which have grown faster than traditional services like trade or transport.

Economic activities are broadly grouped into three sectors: Primary (Agriculture/Extraction), Secondary (Manufacturing/Construction), and **Tertiary (Services)**. The Tertiary sector involves the provision of intangible goods or services to consumers and businesses, such as banking, education, healthcare, tourism, and transport. It is currently the largest contributor to India's GDP.

The **Human Development Index (HDI)**, published by the UNDP, measures development using a composite statistic of three dimensions: 1. **Health**: Measured by **Life Expectancy at Birth**. 2. **Education**: Measured by Mean Years of Schooling and Expected Years of Schooling. 3. **Standard of Living**: Measured by **Gross National Income (GNI) per capita** (PPP). Therefore, "All of the above" covers the key components.

Developing economies share certain common characteristics. India is classified as such primarily due to its **low per capita income** (compared to developed nations) and a continued heavy **dependence on agriculture** for employment (even though the service sector contributes more to GDP). Other features include high poverty levels, income inequality, and infrastructural challenges.

GFCF measures the value of new or existing fixed assets (infrastructure, machinery, etc.) acquired by the government and private sector. It is the standard indicator for Investment in the GDP calculation.