The stanza that indicates the Indexer Discovery feature has not been fully configured (restart pending) on the Master Node is option C. The reason for this is that the pass4SymmKey value is in clear text ('idxdiscovery'), which typically means the configuration changes have not been hashed or encrypted yet. In a fully configured setup, the pass4SymmKey should be hashed, as shown in the other options (A and B). Additionally, option D is related to clustering mode set to 'forwarder,' which is not relevant to Indexer Discovery configuration.