Which of the following security measures would BEST prevent unauthorized access to the device from the Internet?

An administrator sets up a wireless device that they will need to manage across the Internet.
Which of the following security measures would BEST prevent unauthorized access to the
device from the Internet?

A.
Set the channels to wireless 802.11n only

B.
Change the default username and password

C.
Enable the wireless AP’s MAC filtering

D.
Enable the wireless AP’s WPA2 security