Which three statements about MPLS traffic engineering （MPLS TE） are true？ （）

• A、MPLS TE supports admission control
• B、MPLS TE tunnel traffic is a link attribute to compute the TE tunnel path
• C、MPLS TE uses BGP extension to advertise link attributes
• D、MPLS TE provides protection capability
• E、MPLS TE uses RSVP to establish LSP