What must be considered when using 802.11a?

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What must be considered when using 802.11a?
A . It is compatible with 802.11g and 802.11-compliant wireless devices
B . It is chosen over 802.11b/g when a lower-cost solution is necessary
C . It is susceptible to interference from 2.4 GHz devices such as microwave ovens.
D . It is used in place of 802.11b/g when many nonoverlapping channels are required

Answer: D