Which of the following sentences demonstrates the proper use of a colon?
 Question 2 options:
 I have visited: Paris, London, Venice and Rome.
 I have visited many cities including the following: Paris, Rome, Prague, and Krakow.
 The following: are cities I have visited- Rome, Paris, London and Budapest.
 London, Paris, Cinque Terre, and Budapest: My favorite cities I've visited.