a. The interval will never restart before the page postback
is complete.
b. The timer control must be located outside of the
updaetpanel.
c. If the timer expiration triggers a postback while a
previous postback is in progress,the first postback is canceled.
d. The timer must always be specified as a trigger for the
updatepanel which is to be update when the interval expires.
e. None of the above.