Which action fixes this issue?

An engineer is troubleshooting reports from a Cisco 7925 user that is experiencing consistent gaps in audio when roaming from one area of the facility to another.
Packet analysis shows that the phone is flapping between two access points due to poor SNR.
Which action fixes this issue?
A. Add access points to the areas that have a noise floor below -90 dBm.
B. Adjust the roaming threshold of the WLC to -67 dBm for improved access point performance.
C. Use coverage hole detection to allow the access points to compensate for the poor roaming.
D. Redesign the area for sufficient overlap with access points running at reduced power levels.

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