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Which of the following is not one of the cache state?

(a) Downloading

(b) Checking

(c) Idle

(d) Fallback

The question was asked during an interview.

I need to ask this question from Application Cache and Cache Manifest File topic in chapter HTML Images & Web Page Files of HTML

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Right choice is (d) Fallback

To explain I would say: Updateready, obsolete, downloading, checking, idle, uncached are the states of cache. Downloading state of cache denotes that the resources are being downloaded. Checking state signifies that manifest is being checked for the updates.  Idle state denotes that the cache is not currently active for the process to update.

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