How can you best explain server-side caching with web pages?

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A database returns the content of a page once, and then remembers the requester to return the content the next time the page is requested.

A web server interacts with a database once, and then saves a copy of the page content on the server.

A web browser accesses a database once, and then saves a copy of the page content in the server.

A web server interacts with a database once, and then remembers the database the next time the page is requested.