Answer : 2. "सुदर्शन सेतु"
Explanation :

Prime Minister Narendra Modi inaugurated 'Sudarshan Bridge', India's longest cable-stayed bridge over the Arabian Sea in Gujarat. This bridge is 2.32 km long which connects Okha and Bet Dwarka. It is the longest cable-stayed bridge in India. Rs 980 crore has been spent in its construction. There are solar panels on the upper part of the footpath of this bridge which will help in generating one megawatt of electricity. The bridge has also been constructed with four lanes and a 2.50 meter wide footpath on each side.