Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to prevent freezer crystals [title] Make sure your freezer is functioning properly. [step] If you are noticing a lot of ice build up in your freezer, it may be a sign that something isn't functioning correctly. One potential problem is is blocked airflow.

Ending1: Freezers need to have proper airflow around the cooling coils and vents. If any of the freezer's vents or coils are dirty, blocked or clogged, this could cause an issue with ice build up. Ending2: When this obstruction occurs, the flow of air in your freezer slows and stops. Your freezer needs to be clear of these air passages, especially if your freezer has some compressed air. Ending3: Sometimes frozen animals will interrupt the flow of air through the freezer, disrupting the freezer's function. Quickly remove affected animals from the freezer and replace them with solid food. Ending4: If you make repetitive beeps or shaking motions and can't regulate your freezer's temp or creates feedback, do not open your freezer and see if this problem has been fixed. When you are home with a freezer leak, you might want to take your freezer to a specialist to see if you can fix it yourself.

Answer format: ending1/ending2/ending3/ending4