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Google Cloud Certified Professional Data Engineer · Google Cloud
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Option C offers single-cluster routing, meaning that each query is directed to a single specific cluster. This does not protect the transactional workload from heavy analytical loads, which can lead to performance degradation. With multi-cluster routing (option B), Bigtable can automatically distribute the load and avoid congestion on a single cluster.
Multi-cluster satisfy reliability aspect of the question. single cluster may and will cause contention for resources...
To answer some confusion - "single cluster routing" is routing to one cluster per profile, rather than having failover options per profile. So we have two clusters, but it's not multicluster, because we have two profiles, so it's one cluster per profile, so "single cluster routing". We COULD use multicluster, but none of the answers give the steps required to do so, so the assumption as to be that we're using single.