Regarding the mpLS handling mode of TTL, is the following description correct?

A: Pipe mode. When an IP message passes through the MPLS network, the IPTTL minus 1 is mapped to the WLSTTL field at the incoming node. B: The TTL in the C: MPLS label has the same meaning as the TTL field in the head. TTL prevents mpLS networks from developing bad routing. D: Unifore style, when an IP packet passes through the MPLS network, the IPTTL of the incoming node is minus l. The MPLS TTL field is a fixed value. E: In MPLSVPI, if you need to hide the structure of the MPLS backbone network, you can use Uniform mode on Ingress for private network messages .