The distinction between text types (sequences) and genres is fundamental for understanding how communicative purposes are institutionalized in English. Analyze the following statements regarding the classification of texts in the Common European Framework of Reference for Languages (CEFR):

I. A genre is a socially recognized communicative event, such as a business letter or a scientific article, with specific structural conventions.
II. A text type refers to internal rhetorical structures, such as narration or description, which may coexist within a single textual genre.
III. The primary difference between genre and type is that types are determined by social function, while genres are defined by linguistic internalities.

Which of the following are CORRECT: