Why must the electrolyte-fill step be done in a dry room?

Options:

1. Moisture absorbed by the electrolyte can lead to reaction products that prematurely degrade the cell.
2. Moisture in the environment reacts with the solvent in the electrolyte and can cause hazardous conditions inside the cell-fabrication plant.
3. It is more comfortable for the machine operators to work in a low-humidity environment.
4. It is not necessary to perform the electrolyte-fill step in a dry room.