Explanation:

Fourth option is correct.

The Civil Aviation Ministry recently launched its Regional Connectivity Scheme called UDAN (Ude Desh ka Aam Naagrik)
Features of UDAN-

• Under the scheme, the centre has proposed to cap fares at Rs. 2500 for one hour flight for 50% of the seats with the idea to make flying affordable for common man and the remaining on market based pricing.
• Airlines operating under this scheme will get Viability Gap Funding and other benefits such as lower taxes and airport charges to promote regional connectivity.
• A Regional Air Connectivity Fund will also be set up for providing viability gap funding to aircraft operators to serve tier 2 and tier 3 cities.
• Centre has also suggested that states provide incentives to airlines to encourage them to fly on regional routes specifically in unserved and underserved airports. This is in sync with the Draft Regional Connectivity Scheme Rules which was released in July 2016.