Does Nexus Repository supports external MSSQL DB?

Sonatype Nexus Repository
1

What is the compatible version of MSSQL supported in the latest Nexus release (i.e., 3.74.0 or earlier)?
Does Nexus OSS support High Availability?
What is the last version that supports MSSQL as a database?

2

Nexus OSS supports only an embedded database. Nexus PRO adds support for PostgreSQL and high availability.

3

I’m nexus admin and unable to view the Data Store - Administration → Repository → Data Store
How to find whether I’ve the configured OrientDB or Embedded H2 DB on Nexus UI Page ?