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NBAR, or Network-Based Application Recognition, is the correct feature to implement for achieving specific output related to packet classification. It leverages deep packet inspection to identify applications and their traffic characteristics more accurately than traditional methods. This is important because it allows for managing network resources based on the specific needs of different types of traffic, enabling more granular control over bandwidth and quality of service.

By classifying applications intelligently, NBAR can assign appropriate policies and handle network traffic more efficiently, improving overall network management. This capability is crucial in environments where diverse applications require different performance levels and where optimizing resource allocation is necessary to maintain service levels.

In contrast, the other options don't provide the same level of sophisticated packet classification. Class-Based Policing (CAR) mainly focuses on controlling bandwidth usage within the certain configured limits but lacks the application-level insight NBAR offers. Weighted Fair Queuing (WFQ) and Priority Queuing (PQ) primarily deal with prioritizing traffic and managing queues rather than classifying traffic at the application level. Therefore, NBAR stands out as the most suitable choice for the requirement of specific output concerning packet classification.