Explanation
A prototype is a simplified version of a proposed system or product that can be used to demonstrate its functionality and usability to the stakeholders. A prototype can be useful for communicating changes that involve new technology or software, as it allows the users to interact with the system and provide feedback.
Therefore, option D is the best choice, as it would allow the scheduling team to see how the new telephony software and online booking system would work and how they would affect their process. Option A is not a good choice, as a business process model is a graphical representation of the activities, inputs, outputs and resources involved in a business process. It would not show how the new software would work or how the team would be split. Option B is not a good choice, as a business activity model is a high-level view of the business activities that take place within an organisation. It would not show the details of the scheduling process or the new software. Option C is not a good choice, as POPIT is an acronym for People, Organisation, Process, Information and Technology. It is a framework for taking a holistic view of a business situation, but it is not a tool for communicating changes.
References: BCS Practitioner Certificate in BAP Specimen, page 16.