When changing kernel parameters using the sysctl command, the modifications affect files within the /proc/sys directory tree. The /proc directory is a virtual filesystem that provides an interface to kernel data structures, and /proc/sys specifically contains tunable kernel parameters.
C is correct
"sysctl is used to modify kernel parameters at runtime. The parameters available are those listed under /proc/sys/. "
https://lpic2book.github.io/src/lpic2.201.3/?h=proc#procstyskernel
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