What's the most recent non-preview Community Edition Container?

It's not clear to me, when using the InterSystems Container Repository, which version is the best / most recent non-preview Community Edition version to use.

I see lots of 2023.2.x versions, a single 2023.3 and 2024.1 version, but also a latest-cd and latest-em (with no explanation as to what cd and em mean).

I assume the trick is to use one of the latest-xx ones?  If so, which?

Unfortunately I haven't been able to find any explanatory information anywhere about the nomenclature conventions used.

Many thanks