Which of the following is the BEST way to prevent new users from connecting to a wireless access
point, but still allow already connected users to continue to connect?

A.
Create a MAC filter containing the current users.
B.
Turn off SSID broadcast.
C.
Change the encryption type to AES 256-bit for current users.
D.
Reduce the signal strength to 0 percent.
Turning the SSID broadcast off would work if the new users have no knowledge that the ssid existed in the first place.
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The question is asking for the BEST way to prevent new users from connecting. Security through obscurity should always be avoided.
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