When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.<br>A:completely filled with saltwater<br>B:filled with de-scaling compound<br>C:tightly closed to exclude air<br>D:vented to the atmosphere

When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.
A:completely filled with saltwater
B:filled with de-scaling compound
C:tightly closed to exclude air
D:vented to the atmosphere

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