Which of the following are valid interface roles on a FortiGate device?

In the context of FortiGate devices, the valid interface roles provide a categorization for interfaces that helps in defining traffic flow and security policies. Among the provided choices, the option that includes LAN, WAN, DMZ, and Undefined accurately reflects the roles that can be configured on FortiGate interfaces.

The LAN (Local Area Network) role is commonly associated with internal traffic flows within a secure environment, often incorporating trusted devices. The WAN (Wide Area Network) role typically connects to external networks, including the Internet, and involves less trusted traffic. The DMZ (Demilitarized Zone) serves as a buffer zone for hosting public services while protecting the internal network. The Undefined role can be useful for interfaces that do not fit into the traditional categories, allowing for flexibility in configuration.

The other options, while they include relevant terms like Internal and External, may introduce invalid roles or combinations that do not match the recognized terms used within Fortinet's network architecture frameworks. For example, External is often used interchangeably with WAN but is not an officially designated role on a FortiGate device. Similarly, Virtual interfaces are not standard roles but rather refer to specific configurations rather than roles designating traffic types or security levels. Therefore, the inclusion of roles