Which of the following is a common indicator of suspicious behavior?

Suspicious behavior is often indicated by a person displaying signs of nervousness or avoiding direct eye contact. These behaviors can suggest that an individual may be hiding something or feeling uncomfortable, which raises red flags in security assessments. A calm demeanor, for instance, typically signals confidence and transparency, while behaviors such as regular questioning would not inherently indicate suspiciousness. Carrying typical personal items is normal and does not suggest illicit intent. Additionally, arriving in established security vehicles is generally associated with legitimate activities and could signify authorized personnel rather than suspicious behavior. Therefore, the combination of nervousness and a tendency to avoid eye contact is a key indicator that prompts scrutiny in a security context.