What factor is likely to cause the least impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS?

A. Increasing or decreasing the number of spatial streams in use by the client station and AP

B. Implementation of several other clients in the same BSS using 802.11 g radios

C. Implementing Fast BSS Transition (FT) for roaming

D. RF interface from more than 10 nearby Bluetooth transmitters