A technician is tasked with purchasing a wireless router that is backwards compatible with any other wireless device. Which of the following standards should the technician choose?

802.11a operates exclusively on the 5 GHz band and is not compatible with 2.4 GHz devices such as 802.11b and 802.11g clients.

802.11b operates only on 2.4 GHz and is not compatible with 5 GHz devices such as 802.11a clients.

802.11g is backwards compatible with 802.11b but not with 802.11a devices operating at 5 GHz, so it cannot support all wireless devices.

802.11n operates on both 2.4 GHz and 5 GHz bands and was designed to maintain backwards compatibility with 802.11a (5 GHz), 802.11b (2.4 GHz), and 802.11g (2.4 GHz) devices. This dual-band capability ensures that any legacy wireless client can associate with an 802.11n router, satisfying the requirement for universal backwards compatibility.