Note: This article is part of Morningstar's 2018 Portfolio Tuneup week. An earlier version of this article appeared on March 31, 2017.
Putting "conservative" together with "exchange-traded fund" might seem a little like mixing onions in with your oatmeal. They couldn't possibly go together, right?
Christine Benz does not own shares in any of the securities mentioned above. Find out about Morningstar's editorial policies.