About style, which description is not right?

A、From the perspective of the users of language, style is different speakers using language in different ways (to different group of people).
B、From the perspective of the content, the events and activities described, style is saying different things in different contexts in different ways.

C、From the perspective of the ways of expression used, style is saying the same thing in the same ways.
D、From the perspective of the function of the text, style is the functions of texts for different purposes.