If a user made two equivalent request at different dates, the first request on [Fri, 18 Oct 2020 14:19:41 GMT] and the second request on [Fri, 20 Oct 2020 14:19:41 GMT]. And the concept of the caching...

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Extracted text: If a user made two equivalent request at different dates, the first request on [Fri, 18 Oct 2020 14:19:41 GMT] and the second request on [Fri, 20 Oct 2020 14:19:41 GMT]. And the concept of the caching is activated. What will happened if the concept of the caching is available based on the following response cased by the second user request: HTTP/1.1 200 OK Date: Fri, 20 Oct 2020 13:19:41 GMT Server: Microsoft IIS/8.5 Cache-Control: max-age=3600, must-revalidate Expires: Fri, 20 Oct 2020 14:19:41 GMT Last-Modified: Mon, 19 Oct 2020 02:28:12 GMT ETag: "Be86-410-3596fbbc" Content-Length: 1024 Content-Type: text/html O a. The cache will communicate with the original server to fitch the update copy. O b. The cached document can be loaded to the client. O. The cache will return to the user the previous copy. O d. The cache will return to the user the previous copy. After that, the cache will communicate with the original server to see if there have been any changes.