The answer is "A".
https://www.cisco.com/c/en/us/td/docs/optical/15000r8_0/ethernet/454/guide/d80ether/r8vrf.pdf
Step: 3
Command: Router(config-vrf)# route-target {import | export | both} route-distinguisher
Purposes: Creates a list of import and/or export route target communities for the specified VRF.
Given answer A is correct.
B is incorrect because a RT is an extended communitty not standard
C is incorrect because a RD is what allows customers to have overlapping addresses
D is incorrect because RD is what identifies customer routing table.
cisco(config-vrf)#route-target ?
ASN:nn or IP-address:nn Target VPN Extended Community
both Both import and export Target-VPN community
export Export Target-VPN community
import Import Target-VPN community
cisco(config-vrf)#route-target
The correct answer is A. Route targets are used mainly with exporting/importing route in MPBGP, but it could be use in VRF-lite during the route leaking between the VRF's:
https://community.cisco.com/t5/mpls/route-leaking-between-vrf-s-shared-services/td-p/1960139
Its not B, as RT are transmitted as BGP extended communities.
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