Final answer:
Copy editing is not a prewriting strategy; it is part of the revision process after the initial draft, whereas outlining, webbing, and note-taking are prewriting techniques.
Step-by-step explanation:
The strategy that is not considered a prewriting strategy among the options provided is copy editing. Prewriting strategies are techniques that help writers prepare to write by organizing their thoughts and ideas before they begin drafting. Examples of prewriting activities include outlining, which helps create a structured representation of the writer's intentions; webbing, also known as mind mapping, which helps in visually organizing ideas; and note-taking, which allows writers to capture ideas and facts that may be incorporated into their drafts. Copy editing, however, is a part of the writing process that occurs after an initial draft is completed, focusing on correcting errors, ensuring grammatical accuracy, and improving language clarity.