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