Geenah wants to identify where Wi-Fi signals are weakest in her building. What should she create to visually display signal coverage and strength throughout her building?

Heatmaps are used to show signal strength and coverage, allowing organizations to identify areas where there may be poor coverage or where multiple signals may conflict. War walking (and war driving) are techniques used to map wireless access points to geographic locations. Spectrum analysis and SSID plots are not terms used for this type of activity.