Open the provided spreadsheet Incident$\_$Calculator.xlsx and the document guide ENISA$\_$Cost$\_$incident$\_$handling.pdf$.$ Get familiarized with the documents. Please note only the cells highlighted in yellow are meant to be modified for specific scenarios You are going to work with the College numbers and compare them with the Internet Store. When answering the questions below, add a screenshot to support your responses when necessary. $1.$ In the Spam tab, what security controls would help reduce the $\%$ of spam messages getting to user$$s inboxes? $2.$ And how could you reduce the amount of time employees need to identify spam messages? $3.$ Change the two numbers to $1\%$ and $2$ seconds. Why the ROSI $($last tab$)$ is not affected? $4.$ A recent virus infection is quickly spreading over the college network and now $3$ out of $4$ computers are infected. The IT staff is struggling to control the situation and they need $2$ hours to clean each computer, so all of them are completely focused on the incident. How much is this incident costing the College? $5.$ What about the ROSI this time? Explain it$.6.$ To be realistic, the impact of the IDS$/$IPS on stopping a new virus should be $0\mathrm{.}1.$ How this change affects the ROSI? Why? $7.$ After a few days, the IT staff has more knowledge about the new virus and they can tune the IDS$/$IPS to better prevent the infection. Show the impact on the ROSI if the effectiveness doubled from $0\mathrm{.}1.8.$ If the likelihood of a DDoS attack to the College increased to $5\%,$ how much would be lost per year in such attacks?. Tip: please note the values below $0$ use a comma instead of a dot. $9.$ As you noted the increase in DDoS attacks, you seek advice from your IDS$/$IPS provider and they tell you an upgrade in the appliance firmware would help stopping half the attacks. The license cost would increase by $10\%.$ Is it worth it$?10.$ During the negotiation, the vendor offers you to pay $20000$ for $5$ years to acquire the license for the firmware upgrade. Would you accept it$?$