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 domai
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