Which of these BEST summarized the difference between the classification of a person as an immigrant and a refugee?

A) An immigrant can only stay in a country for less than a year, while a refugee can stay forever.
B) A refugee can enter the country without having to register with the government, while an immigrant must register with the government before entering.
C) The term refugee is a legal classification given to a person who would rather live in a country other than that of their birth, while immigrant refers to a person who only relocated to a new country when all other options are taken.
D) The term immigrant refers to any person who lives permanently in a country not of her/his birth, while refugee refers to a person who enters a country because she/he must flee their native land because of war, famine or other disaster.