A hospital environment was designed to guarantee RF coverage at or better than -67 dBm in the 5 GHz spectrum. The customer mandates that RRM be used for DCA and TPC in both bands. After deployment, why do many of the legacy 802.11b/g devices have difficulty maintaining connectivity?

A hospital environment was designed to guarantee RF coverage at or better than -67 dBm in the 5 GHz spectrum. The customer mandates that RRM be used for DCA and TPC in both bands. After deployment, why do many of the legacy 802.11b/g devices have difficulty maintaining connectivity?
A . Excessive co-channel interference in the 2.4 GHz band exists.
B . Excessive overlapping channels in the 2.4 GHz band exists.
C . TPC drastically reduces Tx power in the 2.4 GHz band.
D . TCP drastically increases Tx power in the 2.4 GHz band.

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Answer: C