（单选）某工程师利用 2 台路由器进行 IPv6 业务测试，通过 BGP4+模拟总部与分支机构进行互联互通。如图所示，工程师查看 R1 发出的报文。下列选项正确的是?
UPDATE Message-Border Gateway Protocol UPDATE Message
Marker: 16 bytes
Lengthe: 85 bytes
Type:UPDATE Message (2) Unfeasible routes length:0 bytes Total path attribute length: 62 bytes Path attributes
ORIGIN: IGP(4 bytes)
AS PATH :65001 (9 bytes) MULTI_EXIT_DISC:0(7bytes)
MP_REACH_NLRI(42 bytes)
Flags:0x90(Optional, Non-transitive, Complete, Extended length) Type code:MP_REACH_NLRI(14)
Length38 bytes Address family.IP6 (2)
Subsequent address family identifier. Unlicast (1)
Next hop network address (16 bytes) Next hop.2001:db8:2345:12::1 (16)
Subnethwork points of attachment: 0
Network layer reacha bitity infoamation (17 bytes) 2001:db8:2345:1::1/128
MP Reach NLRI prefie length: 128
MP Reach NLRI prefie 2001:db8:2345:1::1
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