How to determine if and which linux security module (LSM) is available

Is there a way to find out if and in case which linux security LSM (apparmor, selinux, grsecurity) is used by the kernel?

To be more specific let's assume I am a legimate root user of the machine?

If information available also it would be nice to furthermore know:
With regard to the question, is there a difference with considering the machine being (a) a local computer, (b) a dedicated server and (c) a virtual server "vServer"

update

I know that I could for instance install the user-space stuff
(on a debian for instance apt-get install apparmor) and check if it yields
results related to the specific LSM. So I could do for apparmor
sudo apparmor_status which would then for instance yield:
apparmor module is not loaded. which helps me rule out that option. Yet I was looking for a more general approach covering most/all LSM.

update2

I have discovered the path /sys/kernel/security. Maybe this is helpful finding an answer?