When verifying a VoWiFi deployment site survey using a VoWiFi handset, which aspect is most important?

A.
Placing the handset in active survey mode rather than passive survey mode

B.
Testing a constant conversation while roaming from area to area

C.
EnablingQoS features on the handset

D.
Enabling WPA2 authentication and encryption as a worst-case throughput scenario

E.
Holding the handset vertically while recording signal strength and data rate