Consider the following pairs : National Highway - Cities connected 1. NH 4 - Chennai and Hyderabad 2. NH 6 - Mumbai and Kolkata 3. NH 15 - Ahmedabad and Jodhpur Which of the above pairs is/are correctly matched?

The question refers to the old numbering system of National Highways (NH) in India, prior to the renumbering in 2010. 1. Pair 1 is incorrectly matched. Under the old system, NH 4 primarily connected Mumbai to Chennai via Pune and Bengaluru. It did not directly connect Chennai and Hyderabad. Hyderabad was on the old NH 7. 2. Pair 2 is incorrectly matched. Under the old system, NH 6 connected Hajira (Gujarat) to Kolkata via Nagpur and Raipur. It did not connect Mumbai and Kolkata directly, though parts of the route might involve NH 6. 3. Pair 3 is incorrectly matched. Under the old system, NH 15 was a long highway primarily running through Rajasthan and Gujarat, connecting Pathankot to Samakhiali. It did not connect Ahmedabad and Jodhpur directly. Since none of the pairs are correctly matched according to the old NH numbering, the correct option is (D) None.