Which two features can be used to extend VRFs across a campus? (Choose two.)

802.1q trunks allow multiple VRFs to share a single physical link by tagging frames with VLAN IDs that map to separate VRF instances, enabling VRF-Lite extension between campus routers and switches without requiring a full MPLS backbone.

LDP (Label Distribution Protocol) distributes MPLS labels between routers and is a component of MPLS-based VPN architectures, not a standalone mechanism for extending VRFs in a campus environment without a full MPLS data plane.

MPLS TE (Traffic Engineering) optimizes path selection and bandwidth reservation in MPLS networks but does not itself provide VRF extension functionality independent of the broader MPLS VPN framework.

GRE tunnels can encapsulate Layer 3 packets belonging to a specific VRF and transport them across a shared IP infrastructure, effectively extending the VRF instance to a remote device or site within the campus.

Port channels (EtherChannel) aggregate physical links for increased bandwidth and redundancy but provide no VRF separation or routing-instance extension capability.