Which FortiGate feature allows for dynamic routing protocol updates to be propagated through an IPsec...

Auto Discovery VPN (ADVPN) in FortiGate enables dynamic routing protocols (e.g., OSPF, BGP) to propagate updates through IPsec VPN tunnels by automatically creating shortcut paths between spokes. This simplifies configuration and enhances scalability in hub-and-spoke topologies. Route-based VPN (D) supports routing but not dynamic discovery, VRF (C) is for segmentation, and Dynamic Routing Gateway (B) is not a standard Fortinet feature. Exact extract: "ADVPN allows dynamic routing protocols to be used over IPsec VPN tunnels, enabling spokes to discover and communicate directly via shortcuts, improving efficiency in hub-and-spoke setups."