@truserd--correction: "4" in response D refers to BGP version 4, not IP version 4. BGPv4 will be used for IPv4 and IPv6. Everything else you state is correct.
Page 210 in the Study Guide gives a good overview of the command get router info bgp summary and it's output.
C - You can't see if BFD is enabled with get router info bgp summary. For that you would run get router info bfd neighbor. So C doesn't quite make sense as a correct answer, as the information to answer that is lacking.
D: Is just plain wrong, the "4" they are reffering to, and which you see in the output refers to IPv4 which is being used in the BGP configuration.
Thus A & B is correct.
A because the peer state is indeeed established, showing up-time and that is has received 1 prefix.
B because the peers are indeed eBGP peers and are exchanging routing-information.
Think I have to revert. B states that "external" bgp exchanges routes. Oversaw that we have here no public AS range.
0-64.495 would bei public
65.512-65.534 is private
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