The correct answer among the choices is lingua franca. In multilingual
societies and populations, a lingua franca is adopted as a medium of
communication between people with different vernacular languages. Countries
like India and the Philippines with a post-colonial past and a plethora of
local languages use English as their lingua franca, for example.
Unity between the countries for each to work together.
Being the oldest and most effective original telegram, beacon towers are
the most important component of the defensive project on the Great
Wall. They are built continually to pass military messages. In ancient
times, if intruders approached, soldiers on the wall would create smoke
in the daytime and light a fire at night to warn their troops.
