Answer:
a. 802.11ac
Step-by-step explanation:
The other options are wireless networks based on older 802.11x standards. They are called legacy networks/802.11a/g- 802.11a, 802.11g ,802.11b which are much slower than the IP/TCP protocol( Transmission Control Protocol/Internet Protocol are protocols applied in data transmission in computer networks) networks example IPX/SPX, SNA. The later standards are called next generation networks/ 802.11n standards such as 802.11ac like the above. These later ones are much faster than the legacy networks and are able to connect from farther distances