SPLK-2002: Splunk Enterprise Certified ArchitectDemo

The deployer exists precisely to distribute non-replicated, non-runtime configuration updates (apps and configuration bundles) to search head cluster members, because those configurations are not shared through the cluster's own runtime replication mechanism. Therefore the good practice is that the deployer must be used to distribute non-replicable configurations to the members (B). Option D is wrong because the deployer does not distribute "only" via splunk apply shcluster-bundle — members also pull the current bundle when they join or restart — and this describes a mechanism rather than a good practice. Option A ("phone home") and C (configs invalid without the deployer) mischaracterize how the deployer works.