I have had a couple of queries indicating that the online notes, presentation and quiz information may not match - this is in respect to how the respiratory tract is divided.
I would go off the presentation notes - that way if there is any ambiguity if such a question arises then I can argue the point with the RSPH (i.e. that is what you were taught). Here is a picture from one of the PowerPoint sides taken form the course presentation:
So, the trachea is part of the lower respiratory system: I will check that both online revision material and quiz matches the presentation you were given,