After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate re-firing of a burner in order for the （）.<br>A:furnace to be re-purged<br>B:electric charge to buildup in the igniter<br>C:fuel pump to restart<br>D:drum level to stabilize

After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate re-firing of a burner in order for the （）.
A:furnace to be re-purged
B:electric charge to buildup in the igniter
C:fuel pump to restart
D:drum level to stabilize

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