Which resource would be the best for determining the priority order for upgrading the wireless infrastructure in an office?

The best resource for determining the priority order for upgrading the wireless infrastructure in an office is heat maps. Heat maps visually represent the strength and quality of wireless signals throughout the office space, allowing you to identify areas with weak coverage or high interference. By analyzing these visualizations, decision-makers can prioritize upgrades based on the most critical areas that require improved wireless connectivity, thus optimizing performance and user experience.

Network diagrams provide a broader view of the entire network's architecture, which helps in understanding how different components interconnect but do not give precise data on wireless coverage specifics. Nmap is a tool primarily used for network discovery and security auditing that can help identify devices on the network but does not assess wireless signal strength or coverage areas. Wireshark is a network protocol analyzer useful for capturing and analyzing network traffic but does not offer insights into wireless infrastructure coverage or signal strength. Therefore, heat maps stand out as the most relevant tool for this purpose.