Which of the Following Is an Example of a Purchase

Which of the following is an example of a purchase money security interest in consumer goods?

A) A doctor purchasing a computer on credit to create a Webpage to make services and information available to her patients
B) A doctor purchasing on credit a blood glucose monitor to check his own blood sugar levels
C) A doctor purchasing a TV/VCR unit on credit to place in her office waiting room
D) A doctor purchasing an exercise bike for his employees to use over the lunch hour