According to the information provided, which behavior should raise alarms as part of insider threat detection?

The behavior of engaging in excessive printing of files should raise alarms as part of insider threat detection because it can indicate a potential risk associated with data exfiltration or misuse. When an employee prints an unusually high volume of documents, especially if they contain sensitive or confidential information, it may suggest that the individual intends to take this information out of the workplace without authorization.

This behavior stands out because printing physical copies of documents provides an easy means to transfer data outside of controlled environments, which is a common method used by insiders to steal proprietary information. Monitoring printing habits, especially when they deviate significantly from normal patterns, can help organizations identify unusual activities that warrant further investigation.

Regularly downloading documents or participating in professional development are generally routine activities and may not inherently indicate malicious intent when conducted within reasonable limits. Using workplace resources for non-work activities can also be a more common issue, but it does not specifically point to the significant risk of data breaches in the same way that excessive printing does.