Does Specify deadlines for automatic updates and restarts group policy include security updates too?

I was wondering if this Group policy

also includes security updates. if it doesn't, does that mean security updates are automatically installed as fast as possible? sources and references would be appreciated, thanks

May I ask what exactly it is you wish to accomplish? My group policy does not have those options available. From reading the reference article, I believe those policies are for IT professionals who manage MDM managed systems.