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What defines the date when information becomes invalid?
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- expires: date string
- content-type: string
- last-modified: string
- last-modified: string
- None of these
Correct Option: A
expires: sate string defines the date when information becomes invalid. This should be used by the browser to decide when a page needs to be refreshed. A valid date string should be in the format 01 Jan 1998 12:00:00 GMT.