The USPS as of February 2015 has 617,254 active employees and operated 211,264 vehicles in 2014. The USPS is the operator of the largest civilian vehicle fleet in the world. The USPS is legally obligated to serve all Americans, regardless of geography, at uniform price and quality. The USPS still has exclusive access to letter boxes marked ''U.S. Mail'' and personal letterboxes in the United States, but now has to compete against private package delivery services, such as United Parcel Service and FedEx.
Based on the above text, what's the best answer to this question: is fedex part of the us postal service?

pick from the following.
+no.
+yes.
no