Which of the following also targets mobile applications, such as cell phones?

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.

String method __________ returns a String with uppercase letters.

a) Upper b) Uppercase c) ConvertToUpper d) ToUpper