Finish the following sentence with the best choice: How to know if a fridge is cold or not?

Choices:
- Open the fridge's door and if there is a cold sensation coming from it, then it is cold.
- Open the fridge's back panel and if there is a cold sensation coming from it, then it is cold.

Answer:
Open the fridge's door and if there is a cold sensation coming from it, then it is cold.