单选题Which statement about MPLS traffic engineering policy-based tunnel selection （PBTS） is not true？（）AThe tunnel that is not configured with the policy-class command acts as the defaultBEXP selection is between multiple tunnels to the same destinationCThere is no requirement for IGP extensionsDTunnels are configured using the policy-class command and carry multiple EXP valuesEIt supports VRF traffic， IP-to-MPLS switching， and MPLS-to-MPLS switching
单选题
Which statement about MPLS traffic engineering policy-based tunnel selection （PBTS） is not true？（）
A
The tunnel that is not configured with the policy-class command acts as the default
B
EXP selection is between multiple tunnels to the same destination
C
There is no requirement for IGP extensions
D
Tunnels are configured using the policy-class command and carry multiple EXP values
E
It supports VRF traffic， IP-to-MPLS switching， and MPLS-to-MPLS switching
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