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The correct choice for ensuring a wireless network supports a minimum data rate of 54 Mbps effectively includes both 802.11n and 802.11a.

The 802.11g standard, which operates in the 2.4 GHz frequency band, does indeed support a maximum data rate of 54 Mbps, but it is important to note that 802.11n can achieve higher throughput rates due to enhancements like MIMO (Multiple Input Multiple Output) technology and operates on both the 2.4 GHz and 5 GHz bands. This allows 802.11n to provide better performance under various operational conditions (e.g., range, interference).

Additionally, the 802.11a standard also supports data rates up to 54 Mbps and works in the less crowded 5 GHz band, which can offer improved performance over the 2.4 GHz bands used by other standards.

Thus, choosing both 802.11n and 802.11a ensures that the network design can not only meet the minimum data rate requirement but also provide greater flexibility and performance options than if one were limited to just one standard. Overall, using both 802.11a and 802.11n allows for a robust network capable