Exam 300-209 Question id=1750 Secure Communications

Refer to the exhibit.
interface Tunnel1O ip address 209.165.200.225 255.255.255.254 ipv6 address 2001:068:100::1/64 ipv6 enable tunnel source Ethernet0/0 tunnel mode ipsec ipv4 tunnel destination 209.165.201.20 tunnel protection ipsec profile default end
An administrator is adding IPv6 addressing to an already functioning tunnel.
The administrator is unable to ping 2001:DB8:100::2 but can ping 209.165.200.226.
Which configuration needs to be added or changed?

A. No configuration change is necessary. Everything is working correctly.
B. OSPFv3 needs to be configured on the interface.
C. NHRP needs to be configured to provide NBMA mapping.
D. Tunnel mode needs to be changed to GRE IPv4.
E. Tunnel mode needs to be changed to GRE IPv6.

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