When performing this type of post-deployment RF site survey voice over Wi-Fi, what is an action that must be performed?

You were previously onsite at XYZ’s facility to conduct a pre-deployment RF site survey. The WLAN has been deployed according to your recommendations and you are onsite again to perform, a post-deployment validation survey.

When performing this type of post-deployment RF site survey voice over Wi-Fi, what is an action that must be performed?
A . Spectrum analysis to locate and identify RF interference sources.
B . Frequency-band hopping analysis to detect improper RF channel implementations.
C . Protocol analysis to discover channel use on neighboring APs.
D . Application analysis with an active phone call on an VoWiFi handset.

Answer: D