Which behavior may cause concern for security personnel during a visit?

Focusing on the concern for security personnel, the presence of irate visitors can signify potential risks to safety and security. When individuals display anger or aggressive behavior, it may not only indicate possible disruptions but could also suggest deeper issues that could affect the environment, such as a chance of violence or harassment. Security personnel are trained to assess behavioral cues, and an irate visitor may pose immediate risks to themselves, others, or property.

While unauthorized requests for information and business claims without experience also signal potential security issues, the immediate visibility and threat level associated with an irate visitor make this behavior particularly alarming for security staff. Similarly, camera restrictions can raise concerns about surveillance and privacy, but they do not inherently indicate immediate risks to personnel or operations. Therefore, it is the irate visitor's behavior that stands out as most concerning to security personnel in a general visit scenario.