Sociolinguistics 7, Exercise 1: pidgin, creole or mixed language?

(a) Pidgin. Speakers share no language, vocabulary and grammar are limited, and
    it is used for trade. It is not the native language of any speech community.
(b) Creole. Children learn the pidgin as a first language (nativization); the
    result has a consistent grammar and a large stable vocabulary.
(c) Mixed language. It arises in a bilingual population fluent in both source
    languages, and the blend is fixed in grammar and vocabulary.

Source: Wikipedia, Pidgin; Creole language; Mixed language.