Which one of the following is an example of a multi-band device?

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Which one of the following is an example of a multi-band device?
A . A laptop supporting only 802.11n in 2.4 GHz
B . A laptop supporting 802.11n, 802.11ac, and 802.11ad
C . A laptop supporting only 802.11n in 5GHz
D . A laptop supporting only 802.11a

Answer: B