Question no 3: 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: Time Investor Buy Sell Order Type Quantity Price 11:17 A Sell LMT 700 138.03 11:22 B Sell LMT 500 138.12 11:38 C Buy MKT 1000 12:15 Buy LMT 1500 137.95 12:45 E Sell LMT 800 138.00 12:55 F Sell MKT 500 12:57 C Buy LMT 1200 138.25 12:58 H Buy LMT 1200 138.02 13:13 I Sell MKT 700 13:27 J Sell LMT 1200 138.00 14:12 C Buy LMT 700 138.05 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? C. How much money did investor C spend until 14:12? d. What is the limit order book at 14:12?