Identify a true statement about Zeitgeist.
1) It combines the notions of newness and style that somehow together encapsulate the aspirations and accomplishments of an era.
2) It emphasizes the ideas and opinion of people who oppose Art Nouveau.
3) It is an idea that considers only the social achievements of an era.
4) It focuses exclusively on styles that were popular in a particular region and makes use of materials that were common at a particular place.