the primary actor in a use case is generally: a. a person, software system, or hardware device that interacts with the system. b. the project sponsor. c. the programmer. d. the systems analyst.

The correct option is A that is "a person, software system, or hardware device that interacts with the system" as external user is the primary actor in a use case.What is use case?A use case is a detailed explanation of how users will use your website to complete tasks. It describes how a system behaves in response to a request from the viewpoint of a user. Each use case is represented as a series of easy steps that start with the user's objective and end when that objective is achieved. A use case is a description of how someone who uses the process or system in question will actually carry out a task. Although it frequently refers to software systems, it can also refer to any process. Think of yourself as a cook who wants to make a grilled cheese sandwich, for instance.To know more about use case,https://brainly.com/question/12971920?referrer=searchResults#SPJ4