You are about to perform a Tech Refresh upgrade for a customer. The customer wants more details about how the historical

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You are about to perform a Tech Refresh upgrade for a customer. The customer wants more details about how the historical data is maintained. The customer has two sides each with a router, logger, and HDS-DDS. Which is the best explanation?

A. The loggers exchange historical data to keep themselves up to date and each logger keeps its local HDS-DDS up to date.
B. The routers exchange historical data to keep themselves up to date and each router keeps its local HDS-DDS up to date.
C. The HDS-DDSs continuously synchronized the historical data to keep themselves up to date.
D. Each side synchronized its data from the logger using SQL replication.