Which two reasons for implementing Cisco MPLS TE in a service provider MPLS backbone are valid? (Choose two.)
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
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