Which of the following would MOST likely fix this issue?

Lisa, an administrator, has set up an 802.11n wireless network. Users with 802.11n laptops have reported that speeds are slow. After testing, Lisa determines that users max out at 802.11g speeds.

Which of the following would MOST likely fix this issue?
A . Enable wireless multimedia (WMM) for QoS
B . Use the 40MHz channels in the 2.4GHz band
C . Enable access point antenna isolation
D . Limit the clients to 802.11g compatible laptops

Answer: A