The correct response is C. The remote routers need an IPv6 default route pointing toward New York over the correct serial interface. The ::/0 prefix represents the IPv6 default route and sends unknown destinations, including New York loopback reachability, toward the next hop or exit interface. For Cisco CCNA 200-301 v1.1, the important point is the mechanism, not a generic description of the technology. IPv4 default-route syntax and malformed IPv6 prefixes do not satisfy the requirement. When this appears in a network, the symptom normally confirms the answer: the route installed, the state selected, the packet forwarded, the wireless client behaviour, or the management workflow will follow this rule. That is why this answer is the best fit for the scenario and not just a plausible networking term.

VRRP does not provide additonal security features for Cisco devices.
When VRRP is implemented the virtual mac-addres of the VRRP group remains the same so the host does not need to make an arp request to learn another mac-address for the gateway.

Explanation:
Use the displayed drag-and-drop mapping for this item. Static NAT creates a fixed one-to-one translation between an inside local address and an inside global address. The router must identify inside and outside interfaces and define the translation so the web server can be reached through the mapped address. In Cisco CCNA 200-301 v1.1, IP Services questions frequently test the practical boundary between similar features:
what the feature does, where it is configured, and what problem it is meant to solve. Dynamic NAT and PAT do not provide the same permanent server mapping unless configured specifically for static service translation. A clean way to validate the answer is to map the wording of the scenario to the actual device function. If the feature supplies addressing, forwarding, authentication, trunking, route selection, or controller communication, the answer must match that function exactly rather than a nearby protocol name.