Answer:
Disable SSID Brodcasting, Lower Radio Power Levels, Enable MAC Filtering
Explanation:
Based on the information provided within the question it can be said that in this situation there are a couple of things that can be done. For starters you should disable SSID broadcasting, this will prevent anyone from knowing that the network is there. Secondly lower radio power levels so that the signal will not reach the parking lot or anywhere outside the company building. Lastly enable MAC filtering, this determines what individual devices are allowed into the network.