5. (15 pts) For each of the following expressions what is return by the Scheme interpreter ? Assume at Ist is the list ( 1 ((a b) 3) (456) 7 8 9 10 ). a. (cadr (cdr (cdr (cdr ist)))) b. (cons 10 ( cons 6 '(432)) ) c. Consider the f defined below. What is returned by (f '(ab) 4)? Show work by showing all calls to f. (define f (lambda (zn) (cond (( = 0 ( length z)) '0) ((