D.) is metal.

Manufacturers are trying to satisfy all the nuances and requirements to make products that not only meets quality standards, but will also be comfortable for people. The most popular material for creating furniture for public places (airports, stations, etc. D.) is metal. The basis of a chair or chair is made from a pipe or profile, and the back and seat of perforated metal sheets. This combination excellently withstands significant loads, it is not difficult in production and quite comfortable for visitors.