Clarification needed

OK, this is for people in Virginia and Fairfax County.
One question on the U.S. citizenship test is, “Who is the head of your local government?” Since previously it asks for the names of the Governor and the two Senators, I assume it must be the Chairman of the Board of Fairfax County. Or could it also be my District Supervisor? I guess, since the test is not multiple choice but oral, I can just name both, but I thought, a little input from others wouldn’t hurt.
Thanks.