Refer to the exhibit. Which configuration change would maximize the efficiency of both the routing design and data forwarding plane in this topology?

Advertising only the more specific prefixes instead of the aggregate eliminates route summarization benefits, increasing routing table size upstream and reducing forwarding efficiency.

Advertising both more specific prefixes and the aggregate sends redundant routing information, unnecessarily bloating the routing table without any efficiency gain.

Configuring a static route for the aggregate pointing to Null0 on Router B is the standard requirement to ensure the aggregate prefix stays in the routing table and continues to be advertised even if component subnets fluctuate. Without this black-hole route, the aggregate would be withdrawn if no specific subnets exist; with it, any traffic destined for the aggregate that lacks a more specific match is dropped at Null0, preventing routing loops and maximizing forwarding plane efficiency.

Replacing a default route with a less specific aggregate (10.0.0.0/8) from Router A would only cover traffic destined to that single /8 block, losing the broad coverage and routing efficiency a default route provides.