"You use the deployer to deploy configuration updates only. You cannot use it for initial configuration of the search head cluster or for version upgrades to the Splunk Enterprise instances that the members run on."
From the same link you shared. Only A is correct
"Types of updates that the deployer handles
These are the specific types of updates that require the deployer:
All non-search-related updates, even those that can be configured through the CLI or Splunk Web, such as updates to indexes.conf or inputs.conf."
https://docs.splunk.com/Documentation/Splunk/7.3.2/DistSearch/PropagateSHCconfigurationchanges#Types_of_updates_that_the_deployer_handles
"The deployer has these main roles:
It handles migration of app and user configurations into the search head cluster from non-cluster instances and search head pools.
It deploys baseline app configurations to search head cluster members.
It provides the means to distribute non-replicated, non-runtime configuration updates to all search head cluster members".
Only A is correct.
B is just to confuse you by the word "bootstrap"
C is incorrect, because "You do not use the deployer to distribute search-related runtime configuration changes."
You have answer C written incorrectly. Answer C is written as "Distributes non-search related and manual configuration file changes" and that is exactly what the deployer is built for. The answer is A and C.
Only A seems correct.
It deploys baseline app configurations to search head cluster members.
It provides the means to distribute non-replicated, non-runtime configuration updates to all search head cluster members. Does not copy any manual changes to other SHC
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