Which of the following technologies utilizes millimeter wave to achieve high data rates?

802.11ac is a Wi-Fi standard that operates in the 5 GHz band, which is microwave, not millimeter wave.

Z-Wave is a wireless protocol primarily used for home automation, operating on low-frequency radio waves (e.g., 908.42 MHz in the US), not millimeter wave.

NFC (Near Field Communication) is a short-range wireless technology that operates at 13.56 MHz, which is very low frequency and not millimeter wave.

5G (fifth generation cellular technology) incorporates the use of millimeter wave (mmWave) frequencies in its higher spectrum bands to deliver significantly higher data rates and lower latency compared to previous cellular generations. These high frequencies allow for greater bandwidth but have a shorter range.