Which of the following is MOST likely the problem?

A customer is reporting difficulty connecting some devices after replacing a wireless router with a new wireless 802.11ac router. The SSID, encryption and password are the same as the previous router. A technician goes on-site and notices the devices that are no longer connecting appear to be several years ago.

Which of the following is MOST likely the problem?
A . the password needs to be re-entered.
B . there is a security type mismatch.
C . there is insufficient antenna power.
D . there is a frequency mismatch.
E . the channel has changed.

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Answer: D