A stock is currently trading at \$115. A speculator is trying to take a bet that the stock price will rise. She sees put and call options trading as follows: She has $5 million to invest and does not have any positions on the stock or options. How much margin will she have to post if she short sells: (a) The 12 month, strike 115 call? (b) The 12 month, strike 120 call? (c) The 12 month, strike 115 put? (d) The 12 month, strike 120 put