Which 802.11 standard features MU-MIMO and OFDMA to improve performance in dense environments?

• A. 802.11ax reduces bandwidth; MU-MIMO decreases concurrency; OFDMA increases interference.
• B. 802.11ax improves efficiency; MU-MIMO allows multiple simultaneous streams; OFDMA partitions channels for many devices; better in dense areas.
• C. 802.11ax does not support MU-MIMO; OFDMA is for outdoor only.
• D. 802.11ax uses only CSMA/CA; MU-MIMO not supported.

Answer: (B)

802.11ax (Wi‑Fi 6) is designed to boost efficiency in crowded networks. The two features in question work together to do that. MU‑MIMO allows the access point to transmit to and receive from multiple devices at the same time, increasing overall throughput by serving several clients concurrently rather than one after another. OFDMA takes a wider channel and splits it into smaller subchannels, so many devices can be allocated small portions of spectrum simultaneously, which reduces wait times and improves efficiency when many devices are active.

In dense environments, this combination means you can support more devices with less contention and higher effective data rates. The other statements misstate the technology: 802.11ax does not reduce bandwidth and MU‑MIMO does not decrease concurrency; OFDMA is not outdoor‑only; and 802.11ax does not rely solely on CSMA/CA nor omit MU‑MIMO.