1504. According to the illustrated diagram, what statement is true concerning the operation of the «make-up valve»

The "make-up valve" opens when the level in the main condenser hot well rises to a certain level and allows the excess water to be pumped to the distilled water tank by the main condensate pump.
The "make-up valve" opens when the level in the DFT (dearating feed tank) drops to a certain level and allows make-up water to be drawn out of the distilled water tank via vacuum drag into the main condenser.
The "make-up valve" opens when the level in the main condenser hot well drops to a certain level and allows make-up water to be drawn out of the distilled water tank via vacuum drag into the main condenser.
The "make-up valve" opens when the level in the DFT (dearating feed tank) rises to a certain level and allows the excess water to be pumped to the distilled water tank by the main condensate pump.

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