Which of the following statements is correct when talking about /proc/?
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A. B. C. D.C
The correct answer is C. All changes to files in /proc/ are immediately recognized by the kernel.
The /proc/ directory is a virtual filesystem that provides information about the current state of the system. It contains information about hardware, processes, and kernel configuration parameters. The files within /proc/ are not stored on disk; instead, they are generated dynamically by the kernel as needed.
Option A is incorrect. There is no directory named /etc/proc.d/. The /etc/ directory contains configuration files for the system and applications, but it is not related to /proc/.
Option B is incorrect. Although some files within /proc/ are read-only, others are writable. For example, the file /proc/sys/kernel/hostname can be changed to set the system's hostname.
Option D is incorrect. Most files within /proc/ are readable by all users, not just the root user. However, some files contain sensitive information that can only be read by the root user, such as /proc/sys/kernel/random/uuid.
In summary, /proc/ is a virtual filesystem that provides dynamic information about the current state of the system. Changes to files within /proc/ are immediately recognized by the kernel, and most files are readable by all users.