Which of the following is an example of an inappropriate usage incident?

Excessive personal use of company internet is an example of an inappropriate usage incident because it represents a misuse of company resources that can lead to decreased productivity and performance issues within the organization. Employees are typically entrusted with internet access for work-related tasks, and using it excessively for personal activities can hinder their ability to perform job duties effectively. Additionally, excessive internet usage can consume bandwidth and affect the network's overall performance, which could lead to potential disruptions in work processes because of the strain on network resources.

In contrast, other incidents such as unauthorized access to a system, flooding the network with service requests, and unauthorized changing of network settings involve more severe breaches of security protocols and can lead to significant security vulnerabilities or operational disruptions. These actions typically fall under security incidents rather than just inappropriate usage, as they pose a direct threat to the integrity and confidentiality of organizational systems and data.