What function does the Historian Server provide regarding multiple site data?

The Historian Server plays a crucial role in managing and analyzing data collected from multiple sites, enabling users to easily visualize and comprehend overall operational performance. By consolidating data from various sources, it allows for a centralized view that simplifies monitoring and reporting. This capability helps users derive insights from interconnected data, facilitating a comprehensive understanding of processes across different locations.

The other options do not align with the primary function of the Historian Server. While data access restrictions or decision-making processes might be relevant in certain contexts, the core purpose of the Historian Server is to provide an integrated view that aids in understanding trends and relationships across diverse datasets.