Final answer:
The QoS function that categorizes traffic is Classification. It evaluates network traffic based on defined rules and assigns it to categories for further traffic management, unlike policing, shaping, or WFQ methods.
Step-by-step explanation:
The function in Quality of Service (QoS) that places traffic into different categories is c) Classification.
Classification is a key QoS function that examines network traffic based on predefined rules to determine how the traffic should be handled. By looking at factors such as source and destination IP addresses, ports, or even application types, classification sorts traffic into different categories for appropriate handling. In contrast, policing and shaping are QoS mechanisms that limit the bandwidth of traffic, while Weighted Fair Queuing (WFQ) is a scheduling method that organizes traffic to ensure that all flows get a fair amount of bandwidth.