The Potato Salad You Brought to the Picnic Potluck in the Park

The potato salad you brought to the picnic potluck in the park has been sitting out for 4 hours during the meal on a hot sunny day. What should you do with the leftover servings once the meal is finished?

A) Take the salad home, transfer into a new container, and freeze it.
B) Check the salad to see if it has a spoiled smell and throw it away if it does.
C) Throw away the leftovers because they have been at an unsafe temperature too long.
D) Put it in the refrigerator to cool it before serving again.