OSEM bank has a substantial investment in a Cobol software system that is at least one million lines of code in length and has been running for over 20 years. It is used on a daily basis to perform various operations such as managing customer accounts and loans. After several years of modification both planned and ad hoc the system has become too expensive to maintain. As a result, the CEO of OSEM bank wants some advice on the next step to take. Suppose that you have been employed as a software maintenance consultant. What advice would you give to OSEM bank? Indicate the reasons for any recommendations you make.