(b) Give an example A-term for each of the following: i. a closed A-term that is typeable. Include the type of your term. ii. a closed X-term with one redex that has a normal form but cannot be typed. Show the reduction to normal form. iii. an open A-term that is a normal form. iv. a A-term that takes one argument and returns the identity function (4.2.0). Include the type of your term