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  1. What defines the date when information becomes invalid?
    1. expires: date string
    2. content-type: string
    3. last-modified: string
    4. last-modified: string
    5. 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.



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