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Identify the missing word(s) in the following sentence within the context of Microsoft Azure. The topic of actual versus estimated execution plans can be confusing. The difference is that the actual plan includes runtime statistics that are not captured in the estimated plan. For the most part you can use the [A] execution plan while writing your query, to understand its performance characteristics, identify missing indexes, or detect query anomalies. The [B] execution plan is best used to understand the runtime performance of the query, and most importantly gaps in statistical data that cause the query optimizer to make suboptimal choices based on the data it has available.