Which of the following statements is true about personal firewalls?

Personal firewalls are designed primarily for individual computers or devices, serving to monitor and filter incoming and outgoing network traffic. This functionality allows them to effectively block unwanted connections while permitting legitimate communications. By analyzing data packets that enter or exit the network interface, personal firewalls help protect the device from unauthorized access, malware, and various online threats.

The statement about personal firewalls being installed only on hardware-level devices is misleading, as personal firewalls typically run on software installed on individual devices rather than being limited to hardware configurations. The option regarding installation on servers to protect multiple users addresses firewall types related to enterprise environments, which is distinct from the purpose of personal firewalls. Finally, the assertion that physical installation at network entry points is required pertains more to network firewalls or appliances, not personal firewalls, which operate on devices themselves rather than at physical network entry points. This makes the confirmation of statement C even clearer, as it encapsulates the core function of personal firewalls effectively.