Which of the following is NOT one of the three factors that leafs to software vulnerabilities?

dust and heat
insufficient testing
lack of an audit trail
fundamental design flaw

dust and heat

The factor that is NOT one of the three factors that leads to software vulnerabilities is "dust and heat." Dust and heat are not typically considered factors in software vulnerabilities. The three factors that commonly contribute to software vulnerabilities are insufficient testing, lack of an audit trail, and fundamental design flaw.