Which of the following sentences demonstrates the proper use of a colon?

Question 2 options:

I am going to the store and will buy the following: apples, milk, bread, ice cream, and dog food.


The following: are my favorite foods ice cream, pizza, brussel sprouts and cheese.


I have all of these animals as pets dog: cat: hamster: gerbil: and a frog.


Today: the mailman, the UPS man, and the FedEx truck all visited my house.