What is the most likely cause of this result?

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An engineering firm just upgraded their WLAN form nine 802.11n APS to nine 802.11ac APs. After this upgrade, they did not see any improvement in throughput.

What is the most likely cause of this result?
A . APs are transmitting at a low transmit power
B . The clients were not upgraded
C . APs are mounted on the wall
D . The APs are still using the 5 GHz lower band

Answer: A