Which of the following directories will help an administrator identify the specifications of a Linux server in term of resources?

/sys exposes hardware topology and driver/device attributes via sysfs but is oriented toward device management rather than providing the consolidated CPU, memory, and resource summaries found in /proc.

/proc is a pseudo-filesystem that the Linux kernel populates at runtime with files exposing system resource information - /proc/cpuinfo lists CPU model, cores, and flags; /proc/meminfo reports total and available RAM; and /proc/partitions enumerates storage. Because these files reflect live kernel data, /proc is the definitive directory for identifying a Linux server's resource specifications.

/var holds variable runtime data such as logs, mail spools, and package caches and contains no files describing the server's hardware resource specifications.

/usr stores user-space application binaries, libraries, and documentation and does not expose any runtime hardware or resource specification information.