The Kochi Metro is the first:

Underground Metro System
Monorail System
Elevated Metro System
Water Metro System in Kerala. Answer: c

The Kochi Metro is the first elevated metro system in Kerala. It is a rapid transit system serving the city of Kochi in the Indian state of Kerala. The system is operated by the Kochi Metro Rail Limited (KMRL). The Kochi Metro was inaugurated on 17 June 2017 by Prime Minister Narendra Modi. The first phase of the Kochi Metro consists of 13 stations and a total length of 18.2 km. The second phase of the Kochi Metro is under construction and will consist of 11 stations and a total length of 11.2 km. The Kochi Metro is a major infrastructure project that has helped to improve the transportation system in Kochi. It has also helped to boost the economy of the city.

The Kochi Metro is an elevated metro system because it runs on elevated tracks. This means that the trains do not run on the ground, but instead run on tracks that are elevated above the ground. This type of system is often used in cities where there is a lot of traffic congestion, as it helps to reduce the number of cars on the road.

The Kochi Metro is a rapid transit system because it is a high-speed train system that serves a large number of passengers. Rapid transit systems are often used in cities with large populations, as they can help to reduce traffic congestion and improve the transportation system.

The Kochi Metro is a major infrastructure project that has helped to improve the transportation system in Kochi. It has also helped to boost the economy of the city.