Which statement would be true in this scenario?

To change the value for the shmmax parameter, you issued the following command:
echo 2147483648 >/proc/sys/kernel/shmmax
After you set the parameter, a power failure caused the machine to reboot. Which statement would be true in this scenario?

A.
The value for shmmax would be reverted to the old value.

B.
The value for shmmax would be prompted for at next booting.

C.
The new value for shmmax would be retained in the next boot.

D.
The higher value for shmmax among the old and new values would be retained.