Which two reasons for implementing Cisco MPLS TE in a service provider MPLS backbone are...

when Cisco MPLS TE is a prerequisite for implementing RSVP in the backbone

when Cisco MPLS TE is required to reroute traffic within Jess than 1 second in case of a link failure inside the backbone

when Cisco MPLS TE is required to create backup paths independently from the IGP

when Cisco MPLS TE can detect and react to neighbor failures faster than IGPs can

when Cisco MPLS TE is required to route different MPLS QoS service classes through different paths