Apan is used for cooking food by heating food in it on a stove, and an oven, stove, and microwave are available to keep food warm or to heat it up. Given these facts, a what is used to keep food warm or to heat it up among the following options:
- heat
 - gas
 - pan
 - foil
 - freezer
 - fur
 - bag
 - jacket


 

   pan      