When designing for a multiple frequency deployment (5 GHz and 2.4 GHz), which statement is correct?

When designing for a multiple frequency deployment (5 GHz and 2.4 GHz), which statement is correct?
A . The coverage of the multiple bands at the same power will be identical.
B . 5 GHz is a higher frequency and so will travel further and penetrate walls better.
C . 5 GHz should generally be used for planning.
D . 802. 11ac is available in both frequency bands so the design frequency is not important.

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Answer: B