Deploy Vmware automation

Author :

URL : http:////docs.vmware.com/en/vRealize-Automation/7.5/com.vmware.vra.install.upgrade.doc/GUID-A342B08D-C26A-42EE-8E82-D76951C39D0B.html

Topic Name : vRealize Automation Medium Deployment Requirements

Publication Name : Installing and Upgrading vRealize Automation

Product/Version : vRealize Automation/7.5

Question :

I read vrealize automation 7.5 reference-architecture: I see 3 Deployment: Small, Medium,Large. But, I try install. I see only 2 Deploy ment: Minimum and Enterprise. what is different?