ABC Company is having throughput problems on their ERP WLAN. A wireless administrator has noticed in the wireless client station utilities that the MAC CRC Error count is higher on stations with problems than those client stations without problems. A high MAC CRC Error count is NOT attributable to which of the following?

A.
Collisions due to dense population of client stations

B.
Overlapping access point coverage on a single channel

C.
High multipath conditions due to reflected signals

D.
2.4 GHz ISM band interference from sources such as wireless phones

E.
Co-located DCF and EDCA access points that are using non-overlapping 2.4 GHz channels