Cities, such as Ghaziabad, Rohtak, Gurugram, located in proximity to the Metropolitan city of Delhi are also known as:

Satellite towns

The correct answer is Option (4) → Satellite towns

"After independence, a large number of towns have been developed as administrative headquarters, e.g., Chandigarh, Bhubaneswar, Gandhinagar, Dispur, etc., and industrial centres, such as Durgapur, Bhilai, Sindri, Barauni. Some old towns also developed as satellite towns around metropolitan cities, such as Ghaziabad, Rohtak, Gurugram around Delhi. With increasing investment in rural areas, a large number of medium and small towns have developed all over the country.".