What is the name of the free statistical software used for selecting a random sample for audits?

RAT-STATS is the correct choice as it is a free statistical software designed specifically for auditing purposes and is widely utilized for the selection of random samples. It provides auditors with the tools to ensure proper sampling techniques are applied, enabling reliable and accurate results. RAT-STATS helps in determining sample sizes and in performing quantitative analysis on audit findings, which is crucial for maintaining compliance and ensuring the integrity of the auditing process.

The other options, while they may seem plausible, do not actually correspond to known statistical software used for auditing. RAT-STATS stands out because it was developed specifically for the auditing field, making it particularly useful for compliance officers and auditors who need to perform random sampling as part of their audit methodologies.