MPLS has the concept of forwarding equivalence classes, and what is the role of forwarding equivalence classes?
A . Forwarding equivalence class determines how tags are added to the LS
C . Forwarding equivalence class determines how to establish an LSP path
D . Forwarding equivalence class determines how IP datagrams are forwarded on MPLS LSPs.
E . Forwarding equivalence class determines the correspondence between LSP and IP data packet groups
Answer: D