This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to store melons
Store melons at room temperature for up to 2 days to ripen them.
If your melons aren't ripe yet, you can keep them unrefrigerated for up to 2 days. Leave melons uncovered on a counter or tabletop.

Select from:
(I). Alternatively, keep melons in a closed paper bag to accelerate the ripening process. Signs of an unripe melon may include shiny skin, pale coloring, and a light mass..
(II). Lower the temperature in your refrigerator or pantry until they haven't opened up to much if at all possible. Melons taking even a day or 2 to ripen can last 2 or 3 weeks..
(III). Let them cool in the fridge for 3-4 days before storing. The amount of time they should stay in the fridge depends on how ripe they are..
(IV). They should ripen within 4 to 6 weeks. Plan to store melons at room temperature if you plan to use them in a salad or as a fruit topping..
The answer is:
(I).