80. Which of the listed sequence of events occurs when an automatic auxiliary boiler is pre-purged?

The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the closed position.
The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the low fire position.
The damper is moved to the closed position for a given number of seconds and then moved to the low fire position.
The damper in the uptakes is moved to the wide-open position for a given number of seconds and then moved to the low firing rate position.

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