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You are designing a solution based on the lambda architecture. You need to recommend which technology to use for the serving layer. What should you recommend?
Correct Answer: C
Explanation/Reference: Explanation: The Serving Layer is a bit more complicated in that it needs to be able to answer a single query request against two or more databases, processing platforms, and data storage devices. Apache Druid is an example of a cluster-based tool that can marry the Batch and Speed layers into a single answerable request. Reference: https://en.wikipedia.org/wiki/Lambda_architecture