Which of the following is the MOST secure method of connecting all devices while avoiding a performance impact to modern wireless devices?

A network technician has deployed a new 802.11ac network and discovers some of the legacy POS equipment only supports WPA and 802.11a.

Which of the following is the MOST secure method of connecting all devices while avoiding a performance impact to modern wireless devices?
A . Configure the APs to use LEAP authentication to support WPA rather than WPA2 for full compatibility.
B . Configure modern devices under the 5GHz band while dedicating the 2.4GHz band to legacy devices.
C . Connect the legacy devices with a PSK while the modern devices should use the more secure EA
E . Create two SSIDs, one to support CCMP-AES encryption and one with TKIP-RC4 encryption.

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Answer: C