Why did the ping fail?

Refer to the exhibit for the outputs from an ASR9K router.

Why did the ping fail?
A . The ping command is missing the ipv6 option: ping ipv6 2001:db8:10:1:10::1/128
B . There is a problem with the IS-IS configurations
C . The fe80::eab7:48ff:fe2c:a180 next-hop is not reachable
D . The prefix length should be removed from the IPv6 address in the ping command: ping ipv6 2001:db8:10:1:10::1
E . IPv6 is not enabled on the Gi0/0/0/0 interface
F .  The IPv6 neighbor discovery protocol is not enabled on the Gi0/0/0/0 interface

View Answer

Answer: D