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b. Suppose that the following two statements are entered into Prolog mystery(X,[XL],L). mystery(X,[Y|L],[YM]):- mystery(X,L,M). What would Prolog return if one then gives it the following goal? ?- mystery(c)[a,b,c,d],Z). c. Suppose that the following function definition is given to a Common Lisp interpreter: (defun enigma (sym lst) (cond ((null Ist) 0) (equal sym (first lst)) (+ 1 (enigma sym (rest lst)))) (t (enigma sym (rest lst))))) What would the Lisp interpreter return if it is then given the s-expr (enigma b '(a b c b b))