I would say its A and C
RSVP (Resource Reservation Protocol) is not used by P routers to transfer VPN traffic between PE routers in an MPLS network because its primary function is different. RSVP is used by routers to deliver quality-of-service (QoS) requests to all nodes along data flow paths and to establish and maintain state for the requested service
MP-BGP is used to send extended communities; namely the route-distringuisher, which is appended to the prefix to make it unique.
PE Router;
address-family ipv4 vpn vpnrandomname
send-community-extended (enabled by default on newer IOS versions)
neighbor 1.1.1.1 activate (activate the other PE router so I send the VPNV4 prefix: RD: Ipv4-Prefix
To enable MPLS on all routers in the core, you must configure a label distribution protocol. You can use either of the following as a label distribution protocol:
• MPLS Label Distribution Protocol (LDP).
• MPLS Traffic Engineering Resource Reservation Protocol (RSVP)
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