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What happens to the primary member in a MongoDB Server Cluster during the NDB patching process?
Correct Answer: D
According to the NDB documentation, the NDB patching process for MongoDB Server Cluster follows these steps1: * NDB identifies the primary member of the MongoDB Server Cluster and patches it first. * NDB triggers a failover to elect a new primary member from the remaining secondary members. * NDB patches the former primary member, which becomes a secondary member after the failover. * NDB patches the remaining secondary members one by one. * NDB verifies the patching status and the cluster health. This process ensures that the MongoDB Server Cluster always has a primary member available to handle write operations, while minimizing the downtime and the impact on the cluster performance. References: Nutanix Support & Insights, section "Patching a MongoDB Server Cluster"