A systems administrator logs into a Linux server and must identify whether the server is a physical or virtual machine. Which of the following commands should the administrator run?

`vmstat` reports virtual memory statistics, CPU activity, disk I/O, and other system performance metrics, but it does not directly identify whether the system is physical or virtual.

`cat /proc/cpuinfo` displays detailed CPU information, which might contain flags like "hypervisor" that suggest virtualization, but `dmidecode` provides more conclusive and direct system identification.

The `dmidecode` command reads information from the DMI table, also known as SMBIOS, which contains detailed hardware information. This output often includes manufacturer and product names (e.g., "VMware", "VirtualBox", "KVM") that explicitly identify a system as a virtual machine or a specific hypervisor's virtual hardware.

`modinfo` displays information about a specific Linux kernel module, such as its description, author, and parameters, which is not directly used to determine if a system is physical or virtual.