Consider an Online Course Registration System to a college. For example registering courses online in Georgia College (40 points) a) List at least two actors. Explain the relevance of each actor. (2) b) One use case is to register for a course online. List four ADDITIONAL use cases at a comparable level of abstraction. Summarize the purpose of each use case with a sentence. (8) c) Prepare a use case diagram for an online course registration system including all the above use cases and actors. (8) d) Write the Use Case Description for the Use Case "Register for a course Online". (12) e) Prepare a sequence diagram for the same use case Registering for a course Online