Consider the following statements about urban settlements in India:

I. Urban settlements are defined by population size (above 5,000), density (at least 400 per sq km), and non-agricultural workforce (75%+ male workers).

II. Census of India classifies urban areas as Statutory Towns and Census Towns.

III. Million-plus cities (population above 1 million) have grown rapidly, with several emerging as urban agglomerations.

Which of the statements given above are correct?