The Label Distribution Protocol (LDP) can also be secured with MD-5 authentication across the MPLS cloud. This prevents hackers from introducing bogus routers, which would participate in the LDP.
https://www.cisco.com/c/en/us/td/docs/net_mgmt/vpn_solutions_center/2-0/mpls/provisioning/guide/PGmpls1.html
The correct answer is D.
Since the goal is to prevent fake routers, i.e. hackers, from impersonating the CE, I think you need to use BGP MD-5 authentication on the PE.
LDP is used for protection between PE and P, making it difficult for hackers to impersonate PE or P.
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