单项选择题
A.可组合项层次结构的顶层B.每个屏幕的顶层C.每个导航图的顶层D.每个可组合项的顶层
A.findNavController()B.obtainNavController()C.rememberNavController()D.createNavController()
A.NavControllerB.NavGraphC.NavHostD.屏幕