Part A. (All questions in Part A are worth 12 marks each) I 1) There are many threats faced by the revenue cycle while undertaking the basic revenue cycle activates. Describe any five threats in the revenue cycle and identify appropriate controls for each threat. Type your answer here: 2) Organizations change their existing information systems due to many reasons. Identify and explain the main reasons why companies change existing information systems? Type your answer here: 3) Information systems are developed using different approaches, one of them being the prototyping approach. Describe prototyping and identify when prototyping is appropriate. Identify the steps involved in prototyping. Discuss the advantages and disadvantages of prototyping. Type your answer here