Alexa is auditing the accounts receivable department of a client. Alexa wants to check to see whether the client has sufficient controls in place compared to actual practice in the company. Which of the following documentation would assist Alexa to have a successful audit?
1) Systems documentation describing the purpose of the accounting system, and how it interacts with others
2) Operator documentation outlining the protocols for backup and recovery of data for accounting
3) Program documentation that shows how employees can interact with the system and data input and information output
4) User documentation showing how systems should be used compared to the actual practice of employees