Is it better to allow filtering using a dropdown or tabs?

I'm working on an app that allowed users to filter their photos based on time period. Between a dropdown and tabs, which one is best for the user?

Dropdown:

Tabs:

The advantage of using tabs is its less work for the user - in other words, they see all the available filters at once without having to click a dropdown. But my concern with this type of UI is that it might give the impression that it allows multiple selections when they can really only pick one time period at a time.