Which routing instance type is used to facilitate filter-based forwarding?

VRF (Virtual Routing and Forwarding) typically corresponds to `vrf` or `virtual-router` routing instance types in Junos, used for VPNs or routing isolation, not specifically for FBF.

FBF (Filter-Based Forwarding) is the feature itself, not a routing instance type.

The `forwarding` routing instance type is explicitly used in Junos OS to implement filter-based forwarding. Packets matched by a firewall filter can be directed to a specific routing table associated with a `forwarding` instance, allowing traffic to follow policy-based routes.

`no-forwarding` is not a valid Junos routing instance type.