A citizen is best defined as a person who (3 points) a
lives as a permanent resident in a country

b
was born in a country

c
is native or naturalized to a country

d
travels every part of a country

Technically, plato believes that in order to be a perfect society, that society needed to be bound by convention (the uniqe way of society to do things).
That being said, Plato seem to be bound with several traditional point of view. For example, Plato believed the traditional role of women (nurturer in home, should not be involved in workplace)