Which of the following statements is correct when talking about /proc/?

A.
All changes to files in /proc/ are stored in /etc/proc.d/ and restored on reboot.

B.
All files within /proc/ are read-only and their contents cannot be changed.

C.
All changes to files in /proc/ are immediately recognized by the kernel.

D.
All files within /proc/ are only readable by the root user.