In The Hunger Games, who are the careers?

Also, If you are looking for specific names/districts, the
careers in The Hunger Games are Glimmer, the female from District 1, Cato, the male from
District 2, and Clove, the female from District 2.  The names for the boy from District
1 and the boy and girl from district 4 are not given.  Generally, the careers are the
tributes from Districts 1, 2, and 4.