I think this documentation link is just saying you can use your own certificate in place of splunk's default ones. Meaning the answer would just be B unless there was better documentation
it actually should just be B, Splunk Web to search head is SSL secured by default but forwarder to indexer is NOT by default. The table in the link above shows this.
Answer C is not for the SSL but for the Certificate authentication. Encryption between Splunk Web and SH is enabled by default but NOT the "Certificate Authentication" which is the example in C. In fact there is no single case where the Certificate authentication is enabled by default.
It's only answer B. A and C are not valid answers because they mention internal processes that occur within a single box. D is valid but is already turned on by default.
B and C
Ref:
https://docs.splunk.com/Documentation/Splunk/latest/Security/AboutsecuringyourSplunkconfigurationwithSSL#Methods_to_secure_the_Splunk_platform
Answers B and C.
Data encryption is enabled everywhere by default except from Forwarders to Indexers, between Indexers and from browser to Splunk Web.
In the other hand, certificate authentication is never enabled by default anywhere.
Answers B and C should be valid both according to : https://docs.splunk.com/Documentation/Splunk/latest/Security/AboutsecuringyourSplunkconfigurationwithSSL
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