For each of the following examples, state at least one principle of universal design that is not followed:
(a) A stove has control knobs at the front of the burners.
(b) A study lamp has a small-diameter switch that the user must rotate.
(c) A backpack digs into your back and shoulders.
(d) An umbrella flips inside out in the wind.
(e) The support cables of a playground swing are made of strong but small-diameter metal wire.