After a networking intern plugged in a switch, a significant number of users in a building lost connectivity. Which of the following is the most likely root cause?

A VTP (VLAN Trunking Protocol) update, while it can cause issues if misconfigured, is less likely to immediately take down a significant number of users simply by plugging in a switch, especially if the new switch is not yet configured to participate in VTP or has a different domain/password.

A port security issue typically restricts access for specific devices on a single port or group of ports, not causing widespread connectivity loss across an entire building.

An LLDP (Link Layer Discovery Protocol) misconfiguration would primarily affect the ability of devices to discover and identify neighbors, not directly cause a widespread loss of network connectivity.

A native VLAN mismatch between two connected switches can cause spanning tree loops or flood issues, as traffic from different native VLANs might be erroneously forwarded between them, leading to network instability and widespread connectivity loss.