What must be done before beginning a new audit on the RF Gun?

Before beginning a new audit on the RF Gun, it is essential to sign in with a supervisor code. This step is crucial as it ensures that only authorized personnel have access to the auditing functions of the RF Gun system. The supervisor code often provides a higher level of access compared to standard user codes, which is important for maintaining data integrity and security during the auditing process.

Having a designated supervision code helps to control the audit process, limiting it to trained and responsible staff who understand the implications of making changes or accessing sensitive data. This protocol is necessary in environments like Costco where inventory management and accurate reporting are critical to operational efficiency and accurate financial reporting.

The other options, although they may seem valid at first glance, either do not directly relate to the specific requirement of starting an audit or are operational steps that may not necessarily be prerequisites specifically for the audit process on the RF Gun.