IBM stock is traded in NYSE. Assume that at 18 February 2019 at 11:15 AM the limit order book of IBM was empty. Following are the trade orders for IBM after 11:15 AM: Price 138.03 138.12 Time 11:17 11:22 11:38 12:15 12:45 12:55 12:57 12:58 13:13 13:27 14:12 Investor A B D E F H I J Buy Sell Sell Sell Buy Buy Sell Sell Buy Buy Sell Sell Buy Order Type Quantity LMT 700 LMT 500 MKT 1000 LMT 1500 LMT 800 MKT 500 LMT 1200 LMT 1200 MKT 700 LMT 1200 LMT 700 137.95 138.00 138.25 138.02 138.00 138.05 a. What is the bid-ask spread at the following points in time: 12:55; 13:27? b. What is the last transaction price as of the following points in time: 12:15, 14:12? How much money did investor C spend until 14:12? d. What is the limit order book at 14:12? C.