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When configuring WLAN implementations for live video streaming solutions that transmit to multiple recipients, multicasting is the key capability to enable. Multicast allows for a single stream of data to be sent to multiple recipients simultaneously, which is particularly beneficial in scenarios where many clients need to receive the same video feed, such as in live events or broadcasts.

Using multicasting reduces the amount of bandwidth consumed and the load on the network compared to unicast, where a separate stream would need to be established for each recipient. This makes the delivery of video more efficient, minimizing latency and ensuring a smoother viewing experience for all users involved.

While other options, such as IPSec for secure communications or IPv6 for network addressing, provide important functionalities, they do not specifically address the requirement for efficient data streaming to multiple users within the context of WLAN implementations. Secure TCP might provide a secure transport method but would not enhance the efficiency of data delivery to multiple clients like multicasting does.