Which Wi-Fi standard enhances devices' ability to roam effectively between access points?

The choice of 802.11r is pertinent because this standard specifically addresses the need for faster and more seamless roaming between access points within a wireless network. It achieves this by enabling a feature known as "Fast BSS Transition," which allows devices to switch from one access point to another with minimal delay. This is particularly beneficial in environments where continuous connectivity is essential, such as in enterprise settings or during voice-over-IP calls.

By facilitating quicker handoffs, 802.11r enhances the user experience by reducing latency and maintaining a stable connection, which is crucial for applications requiring a constant data stream. In contrast, the other standards mentioned do not focus on improving the roaming capabilities in the same way, making 802.11r the optimal choice for this specific need in Wi-Fi networking.