About the company: TheSleepyheads is a growing mattress in a box company with, now, 3 branches. Some changes have been made to the company networks to accommodate this growth. The Perth branch is still the main branch for the company; however, there are smaller branches in Melbourne, and Christchurch. Each branch now has 5 departments with approximately 50 employees working in each department. The Perth branch now has a mail server, 2 file servers, 2 web servers, a DNS server, and 4 database servers. The smaller branches each now have a mail server, 2 database servers, and two file servers. To the best of Jessica's knowledge, all of the company data, including all employees' usernames and passwords for all branches, are being stored in plaintext form. Jessica is concerned that employees' credentials may be accessed from someone outside of the company and be used to obtain company data. As the company grows, Jessica fears legitimate users may be impersonated to access company network resources. You, as a consultant, know that Kerberos would be the answer to Jessica's requirement regarding user authentication. Your task for this part is to explain how Kerberos cryptography can be used for the user authentication purpose. The following aspects may be explained: Why Kerberos should be chosen for this purpose? Does Kerberos use symmetric or asymmetric cryptography? Explain. How does Kerberos authenticate each client? You may discuss Kerberos Ticket-Granting Server (TGS) and Ticket Granting Ticket (TGT). How does Kerberos tackle the problem of replay attacks? You must also: Recommend a commercial software program for user authentication; and Explain and justify your recommendation clearly