Which element helps to lay the foundation for solid network security forensics?

This is because network forensics relies on the analysis of network traffic data, which is often time-stamped by the devices that generate or transmit it. Having a synchronized and accurate clock across all network devices helps to establish a reliable timeline of events and correlate different sources of evidence12

A. Enable BPDU protection and loop protection on edge switch ports is not related to network security forensics, but rather to preventing network loops and topology changes caused by rogue switches or bridges3

B. Enabling debug-level information for network infrastructure device logs might provide more details about the network activity, but it also consumes more resources and storage, and might not be relevant or useful for forensic analysis. Moreover, debug-level information might not be available for long-term retention or legal purposes4

C. Implementing 802.1X authentication on switch ports that connect to APs is a good security practice to prevent unauthorized access to the network, but it does not directly help with network security forensics. 802.1X authentication does not capture or record network traffic data, which is the main source of evidence for network forensics