Final answer:
For setting up a wireless router with fast data speeds on the 5 GHz frequency, the user should select the 802.11n standard. It provides better speed, range, and reliability over the 5 GHz band compared to older standards among the ones listed.
Step-by-step explanation:
If a user wishes to set up a wireless router with the fastest data speeds using the 5 GHz frequency, the best option would be 802.11n. While standards like 802.11a, 802.11b, and 802.11g have their own specifications and frequencies, 802.11n specifically supports both 2.4 GHz and 5 GHz frequencies. This standard not only provides better speed but also a wider range and improved reliability compared to its predecessors. It is to be noted that as of my knowledge cutoff in 2023, even newer standards like 802.11ac and 802.11ax (WiFi 6) exist which offer even greater speeds and performance over 5 GHz. However, since these options were not listed in the question, 802.11n would be the appropriate choice from the provided selections.