Final answer:
The QoS option that prioritizes video traffic on a WLC is Platinum (D). The Platinum level is designed for the highest quality service, ensuring smooth video experience with the least delay and highest throughput. This falls within Access Category (AC)_VO, indicating voice and video-optimized traffic.
Step-by-step explanation:
The Quality of Service (QoS) option that prioritizes video traffic on a Wireless LAN Controller (WLC) is D) Platinum. In the context of WLC QoS, traffic is classified into different levels of priority, from lowest to highest: Bronze, Silver, Gold, and Platinum. Video traffic, which is sensitive to delays and requires a higher level of service quality, is best served by the Platinum profile. The Platinum level is designed to provide the least delay and highest throughput, ensuring a smooth video experience.
On Cisco WLCs, for example, QoS policies are implemented using different profiles that map to the IEEE 802.11 standards for wireless traffic prioritization. The Platinum level typically corresponds to the voice and video conferencing application, which is part of the Access Category (AC)_VO - indicating the traffic is voice-optimized. The Gold level might be used for video that is less sensitive to latency, whereas Silver might be suitable for best effort traffic, and Bronze for background tasks. Understanding these classifications is crucial for network administrators who need to manage network performance and ensure critical applications have the necessary resources for proper functionality.