Final answer:
Firm structure is not one of the categories of employee fraud symptoms; instead, accounting anomalies, analytical anomalies, and tips and complaints are considered fraud symptoms.
Step-by-step explanation:
The category that is NOT one of the categories of employee fraud symptoms is firm structure. Employee fraud symptoms often include signs such as accounting anomalies, which are irregularities in the financial records; analytical anomalies, which consist of inconsistencies found when comparing financial reports to industry norms; and tips and complaints, which are reports from employees, customers, or vendors about suspicious behavior. However, firm structure is generally not considered a symptom of employee fraud but rather relates to the organizational design and governance of a company.