In MPLS networks, what is the benefit of disabling TTL propagation?

A.
to improve MPLS convergence time

B.
to improve the IGP convergence time

C.
to hide visibility to the core (provider) routers in the MPLS network

D.
to provide a visible extension of IP TTL functionality in an MPLS-enabled domain

E.
to provide a visible extension of MPLS TTL functionality in a non-MPLS-enabled domain