Read the following facts about some computer crimes.What controls might prevent these issues from happening?Give one control per computer crime and explain how it would prevent the issue.If you believe that more than one control may be needed to prevent one of the issues you may include more than one control for that issue in your response.

1. The sales manager receives a bonus based on sales.He records fictitious sales near the end of each year, and then reverses the sales entry in the accounting information system in the following year, after his bonus has been calculated.

2. The accounts payable clerk downloads free software that he believes will make his job easier.This software has a hidden virus in it which infects the network.

3. The accounts payable clerk is able to set up fake vendors and pay them for fake invoices.These payments actually end up going to the accounts payable clerk's personal bank account.