I want to know which loadbalancing algorithm(s) are used in AEM dispatcher ?

Unable to create a new AEM project in either eclipse or Maven command line:Unable to create project from archetype [com.adobe.granite.archetypes:aem-project-archetype:20 -> https://repo.adobe.com/nexus/content/groups/public]Please let me know when the Adobe server is available.

What is Adobe recommendation to integrate solr out of these two:Solr as oak index or AEM with solr as rest based integration.

I am preparing for AEM6 certification with exam code  9A0-384, having done that and when I was attempting to enroll for this exam, I have realized that this exam has been removed from Pearson Vue. Does anyone know when will it be available again.