Which two conclusions can be interpreted from these frames?

The network administrator receives complaints of slow wireless network performance and performs a sniffer trace of the wireless network in preparation for migration to 802.11n. The sample capture shows frames that contains AP beacons with NonERP_Present bit set to 1 and frames with RTS/CTS.

Which two conclusions can be interpreted from these frames? (Choose two.)
A . The network is performing slowly because 802.11n clients are already mixed with 802.11g clients.
B . The network is performing slowly because 802.11b clients still exist in the network.
C . The network is performing slowly because a wireless client is incorrectly configured, which results in RF interference.
D . Possible 802.11b wireless clients are located only in the AP cell radius where the sniffer capture was performed.
E . Possible 802.11b wireless clients could be located anywhere in the wireless network.

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Answer: B, E