Identify the missing word(s) in the following sentence within the context of Microsoft Azure. Azure Synapse Analytics leverages a massively parallel processing architecture. This architecture includes: The [A] is the brain of the architecture. It's the front end that interacts with all applications. The MPP engine runs on the Control node to optimize and coordinate parallel queries. The [B] provides the computational power. The data to be processed is distributed evenly across the nodes. Users and applications send processing requests to the control node.