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

B.
sysctl shmmax=2147483648.

C.
sysctl kernel.shmmax=2147483648

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

E.
export kernel.shmmax=2147483648