Here is a goal: To thaw frozen fish or shrimp

How would you accomplish this goal?

OPT:
(a). Seal the food in a plastic bag and make sure it's completely sealed. Place the bag in a tub of warm water. Let it sit for a few hours to make sure it thaws completely before using..
(b). Seal the food in a plastic bag and make sure it's completely sealed. Place the bag in a pot of cold water. Let it sit for about an hour to make sure it thaws completely before using..
(b).