What must be considered when using 802.11a?
A.It is compatible with 802 lib- and 802 11-compliant wireless devices B.It is used in place of 802 11b/g when many nonoverlapping channels are required C.It is susceptible to interference from 2 4 GHz devices such as microwave ovens. D.It is chosen over 802 11b/g when a lower-cost solution is necessary正确答案B
