If data is not yet cached by FlexCache, how is it retrieved when requested?

• A. It returns an error if data is not cached
• B. It serves stale data from cache
• C. It fetches data on-demand from the origin
• D. It preloads the entire dataset on creation

Answer: (C)

When data isn’t in the cache yet, FlexCache treats it as a miss and goes to the origin to fetch the data on-demand. It retrieves the data from the primary source, returns it to the requester, and then stores it in the cache for future requests. This approach avoids preloading everything and ensures fresh data is obtained from the origin when needed. If the origin is slow, the first access may take longer, but subsequent requests are served quickly from the cached copy.