Your company shares a building with a competitor's branch office. Recently, you noticed that some computers other than company computer have tried to connect to the wireless network unsuccessfully. When you are in the parking lot, you also notice that the company's wireless network SSID can be seen on your smartphone. What can you do to make sure no one outside your company can gain access to its wireless network?
a. Disable SSID broadcasting.
b. Lower radio power levels.
c. Add access points.
d. Enable MAC filtering.
e. Set up firewall settings.