MU-MIMO technology is the correct answer because it enables a wireless access point to transmit data to multiple clients at the same time, rather than sequentially. This is particularly beneficial in high-density environments with many clients, as it improves throughput and network efficiency. MU-MIMO requires devices to also support this technology, but it is becoming increasingly common in modern wireless devices. The option mentioning spatial streams refers to a capability of MIMO technology, but spatial streams do not address the simultaneous communication to multiple devices. Beamforming is a technology used to focus a wireless signal towards a specific receiving device, rather than spreading the signal in all directions, and while it is useful, it does not facilitate the AP communicating with multiple devices simultaneously like MU-MIMO does.