Which of the following is a key capability of Amazon QuickSight?

Amazon QuickSight is primarily designed for business intelligence and data visualization. Its key capability lies in enabling users to create interactive dashboards and perform data visualization. QuickSight allows users to analyze data from various sources and present it visually through charts, graphs, and dashboards. This makes it easier for stakeholders to derive insights and make data-driven decisions.

In contrast, the other options focus on different functionalities. Data warehousing refers to the storage and management of large sets of data for analysis but is not a core function of QuickSight itself. Machine learning model training is associated with platforms like Amazon SageMaker, which focuses on developing and deploying machine learning models rather than visualization. Real-time data replication pertains to keeping data synchronized across different databases or systems, which is outside the primary scope of QuickSight’s visualization capabilities.

Thus, the emphasis on dashboard creation and data visualization makes it clear why this option is the most accurate representation of what Amazon QuickSight is designed to do.