Answer:
lean media
Step-by-step explanation:
Dr. Thomas uses email as a medium of lean media to convey messages.
Lean media may be defined as the source of conveying messages that are short or of lean capacity. It is meant for instant messages and message and information that is not considered to be of out most importance. Whereas a rich media is a video chat or face to face communication.
Dr. Thomas send emails to her patients to follow up with them and also encourages her patients to call her for appointments or any questions. She uses email as a source of lean media for this communication.