About one of every three of brazilian city residents live in makeshift communities located on the edge of the city called
a. the central city
b. the hinterland
c. favelas
d. shantytowns

The correct answer is - C. favelas.

The favelas are makeshift communities in Brazil. They are located on the edges of the cities, usually the larger ones. Aproximately one third of the residents of the cities live in the favelas.

This type of communities have initially been formed by soldiers, but over time have become the places where the poor people live. The infrastructure is not in good condition, the living conditions on relatively low level, and the population density is incredibly high. Unfortunately, the crime flourishes in this communities because the people are poor and do not choose means as to how to get to bigger profit.

radio frequency identification

explanation:

rfid (radio frequency identification) is a form of wireless communication that incorporates the use of electromagnetic or electrostatic coupling in the radio frequency portion of the electromagnetic spectrum to uniquely identify an object, animal or person.