Answer:
C. "a sales assistant taking an order for a limited partnership unit".
Step-by-step explanation:
Based on the answers choices provided, the correct answer would be C. "a sales assistant taking an order for a limited partnership unit". This is because choices A and D involve administrative personnel, and such personnel are not registered thus making them invalid. Answer B would not be correct either because the secretary is taking "messages" which are just information that needs to be passed to the authorized individual and not an "order" like in choice C.