what s the benefit of disabling TTL propagation?

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

A.
To provide a visible extension of MPLS TTL functionality in a non MPLS-enabled domain

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