A martial arts organization has been expanding throughout the mid-Atlantic states and has hired a business analyst (BA) to create a system that will enable the organization to manage its growing needs. The following list describes some of the operations of the martial arts organization:

✑ The martial arts organization offers a variety of seminars to trainees that span the entire spectrum of the martial arts training system.

✑ Each seminar is made up of a set of techniques.

✑ Coaches in the martial arts organization are assigned seminars to teach according to the area that they specialize in and their availability.

✑ The martial arts organization publishes and maintains a web-based calendar of the different seminars (and the assigned coaches) every quarter for the trainees to view.

✑ The seminar administrator in the martial arts organization manages the seminars (including seminar content), assigns seminars to coaches, and defines the seminar schedule.

To ensure understanding of the business need, the BA has created three Unified Modelling Language (UML) diagrams, which are shown below:

The BA is working on the design options for the future state at the martial arts organization. There are several design elements that need to be considered for the future state. Which of the following design elements does the Activity Diagram address?