The correct answer is Gurgaon.
Gurgaon is a city in the Indian state of Haryana. It is located in the National Capital Region (NCR) of India, and is one of the most populous cities in the state. Gurgaon is known for its IT industry, and is home to many multinational companies. The city is also a major commercial and financial center.
Gurgaon shares a border with the national capital, Delhi, on the south. The city is connected to Delhi by the Delhi-Gurgaon Expressway. Gurgaon is also well-connected to other major cities in India, such as Mumbai, Chennai, and Kolkata.
The other options are incorrect because they do not share a border with Delhi. Faridabad is located to the west of Delhi, Jhajjar is located to the north of Delhi, and Sonipat is located to the east of Delhi.