When the MCI Center Was Enlarged, the Management Decided to Buy

When the MCI Center was enlarged, the management decided to buy aluminum railing from Western Metal Fabricators, the company that had provided all of the railings when the center was constructed. Ashton works for Western Metal Fabricators and was sent to the center to take measurements and to get the sales contract signed. Ashton acted as a(n) :

A) consultative sales person.
B) outside order taker.
C) amusement broker.
D) sales agent.
E) missionary sales person.