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  1. The interval will never restart before the page postback is complete

  2. The timer control must be located outside of the UpdatePanel

  3. If the timer expiration triggers a postback while a previous postback is in progress, the first postback is canceled

  4. The timer must always be specified as a trigger for the updatepanel which is to be update when the interval expires

Answer: Answer is d
Further Reading:

When timer control inside an UpdatePanel Control, the JavaScript timing component is re-created only when each postback finishes. Therefore, the timed interval does not start until the page returns from the postback. But, if the timer controls is outside an UpdatePanel control, the JavaScript timing component continues to run as the postback is being processed. In this case, if a new postback is initiated while an earlier postback is being processed, the first postback is canceled. Useful resources, Timer Control

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