It is possible to configure kernel parameters at runtime (e.g. the maximum size of the
shared memory segment (shmmax)). In which TWO ways can this be changed to 2GB
(2147483648 Bytes) on a running system?

A.
echo 2147483648 > /proc/sys/kernel/shmmax

B.
export kernel.shmmax=2147483648

C.
sysctl kernel.shmmax=2147483648

D.
sysctl shmmax=2147483648.

E.
Edit /etc/shmmax and set the parameter to 2147483648.