In post-deployment testing you have identified an area where there is a substantial rate-shift issue causing problems with the existing Cisco 7921 phones. How might you resolve this issue?
A.
Increase the AP power level to maintain higher throughput further away from the AP.
B.
Increase client RSSI, SNR, and retry values to maintain connectivity to the original AP for as long as possible.
C.
Change VoWLAN to 7925 phones.
D.
Reduce the power level of the AP so that roaming occurs before the client experiences the substantial rate shift.
Explanation: