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 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 C D E F C H I J C Buy Sell Sell Sell Buy Buy Sell Sell Buy Buy Sell Sell Buy Order Type Quantity LMT LMT MKT LMT LMT MKT LMT LMT MKT LMT LMT 700 500 1000 1500 800 500 1200 1200 700 1200 700 Price 138.03 138.12 137.95 138.00 C. How much money did investor C spend until 14:12? d. What is the limit order book at 14:12? 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?