Which Is the Correct Order of Events When an Individual

Which is the correct order of events when an individual buys a stock through a brokerage firm?
I. The order is transmitted to the main office of the brokerage firm.
II. The customer places the order with their local stockbroker.
III. The confirmation of the order is sent to the broker placing the order.
IV. The order is sent to the floor of the exchange.

A) I, II, III, IV
B) II, I, III, IV
C) II, IV, I, III
D) II, I, IV, III