A service provider creates a network design that runs MPLS in its WAN backbone using OSPF as
the IGP routing protocol. What would be two effects of additionally implementing MPLS-TE?
(Choose two.)

A.
MPLS-TE is required to reroute traffic within less than 1 second in case of a link failure inside
the backbone.

B.
MPLS-TE is required to route different MPLS QoS service classes through different paths.

C.
MPLS-TE and OSPF cannot be used together inside one MPLS network.

D.
MPLS-TE cannot use OSPF for the traffic path calculation.

E.
MPLS-TE is required to create backup paths independently from the IGP.