Refer to the Cisco IOS XR router output exhibit,
RP/0/RP1/CPU0:R1#show route vrf red ipv6
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - ISIS, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, su - IS-IS summary null, * - candidate default
U - per-user static route, o - ODR, L - local
Gateway of last resort is not set
B 2001:db80:beef:1::/64
[200/0] via ::ffff:192.168.253.6 (nexthop in vrf default),07:04:14
which method is being used to transport IPv6 traffic over the service provider network?
A. native IPv4
B. 6PE
C. native IPv6
D. dual stack
E. 6VPE