The correct answer is Chandigarh.
Chandigarh is a union territory of India that serves as the capital of the states of Punjab and Haryana. It is located in the northwestern part of India, at the foothills of the Himalayas. Chandigarh is a planned city, and is known for its modern architecture.
Delhi is a union territory of India that is located in the northern part of the country. It is the capital of India, and is one of the most populous cities in the world. Delhi is a historical city, and is home to many important landmarks, such as the Red Fort and the Jama Masjid.
Puducherry is a union territory of India that is located on the southeastern coast of the country. It is a former French colony, and is known for its French architecture and culture. Puducherry is a popular tourist destination.
Dadra and Nagar Haveli is a union territory of India that is located on the western coast of the country. It is a former Portuguese colony, and is known for its Portuguese architecture and culture. Dadra and Nagar Haveli is a popular tourist destination.
Chandigarh is the only union territory that shares a border with Haryana.