4. {1 point) A painting in an art gallery has height h and is hung so its lower edge is a distance (1 above the eye of an observer (as in the gure). How far from the wall should the observer stand to get the best vtiew'?I (In other words, where should the observer stand so as to maximize the angle 9 subtended at his eye by the painting?) (Your answer may depend on b and d.) A}