When ABC stock is trading at $40.50, an equity trader places an order to buy 500,000 shares of the stock at 3:58 PM ET, filled at $40.60, and places another order to buy 400,000 shares at 3:59 PM filled at $40.90. Because of these actions, the stock closes at $41. The equity trader then uses those purchased shares to fill Market-On-Close orders to buy that the firm was holding for clients. This is an example of: A Insider trading B Front running C Marking the close D Painting the tape