In the following question, sentence given with blank is to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.
World's first fully solar-powered airport is in India. The Cochin International Airport is powered by a solar plant comprised of over 46,000 solar panel units.
The social security is a welfare plan and an insurance company that regulates the benefits for survivors of deceased workers, disabled workers, retirees and death as well as survivorship benefits.