Whatever you do 1,2, or 4 just make sure you've got a good lump of concrete underneath to hold the pole or spike or you'll see your washin flying into the neighbours !
alternatively use a scaffold tube cut down and drill a pin through the tube and spike when you have set the pole in the ground. You can then remove the line when not in use to give more space.
general builder, maintenance engineer, gas and plumbing installations, extensions etc