Company-A is located in an office building and had no problems with their wireless LAN until Company-B installed a wireless LAN in an adjacent office. Now, Company-A’s wireless LAN is experiencing significantly decreased throughput. What is the most likely source of the decreased throughput?

A.
Company-B installed a wireless LAN secured with WPA

B.
Company-A uses an 802.11b network, and Company-B uses an 802.11g network

C.
Both Company-A and Company-B have their access points configured for channel 1

D.
Both Company-A and Company-B have their SSIDs set to the same value