Refer to the exhibit.

 The exhibit provided appears to be a floor map overlay with Cisco CleanAir Zone of Impact for interferers, which shows different areas affected by interference on a wireless network. The area labeled ‘A’ indicates the greatest impact on the wireless network due to its larger size compared with other zones, suggesting more significant interference or a stronger source of interference within this zone. References := ( CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide )