
For #4, if they are employees, contractors, or otherwise employed by the company, they must be licensed.
You will certainly need #1 with either a Standard or Enterprise license. For #2, you will need Standard (if SharePoint Standard) or Standard+Enterprise (if SharePoint Enterprise). #3 is correct.
See https://www.microsoft.com/licensing/terms/productoffering/SharePointServer/EAEAS
Pick your licensing type on that page to get Use Rights etc.
I strongly suggest you work with your Microsoft or VAR licensing team rather than relying on forum posts :-)