Which type had to select to run ELM now

I have installed vcsa 6.7 (using VCHA ) with embeded PSC on siteA and installed vcsa 6.7 (using VCHA) with embeded PSC on siteB now want to create ELM between them which one had to use?

1. Repoint vCenter Server with Embedded Platform Services Controller to Another vCenter Server with Embedded Platform Services Controller in a Different Domain
2. Repoint a Single Embedded Node from One Domain to an Existing Domain
3. Repoint an Embedded Node from One Domain to an Existing Domain with a Replication Partner
4. Repoint an Embedded Node to a New Domain

BR