A customer brings you a previously completed site survey for the initial wireless implementation
from 12 months ago. The customer currently has six access points deployed in the warehouse.
The survey shows that the installed coverage provides for a 15-percent overlap between cells at
5.5 Mbps, and a 5-percent overlap at 11 Mbps. This solution has proven to provide adequate
coverage and roaming capabilities for the data applications. However, the customer has recently
moved to a VoIP telephony solution and has attempted to add seven Cisco 7920 wireless IP
phones with limited success. Why has the customer only had limited success with the current
deployment to meet the data needs?

A.
inadequate data rate

B.
inadequate overlap

C.
too many Cisco 7920 wireless IP phones per access point

D.
inadequate throughput