5. (8 pt) [High order function programming] Given the following definitions of pair and apair (define pair (lambda (fst snd) (lambda (op) (if op fst snd)))) (define apair (pair 2 3)) (a) (2 pt) Explain what is apair? (b) (2 pt) Modify pair to support arithmetic between two elements of apair (c) (4 pt) Write a FuncLang program to determine if the two elements of apair are equivalent. 5. (8 pt) [High order function programming] Given the following definitions of pair and apair (define pair (lambda (fst snd) (lambda (op) (if op fst snd)))) (define apair (pair 2 3)) (a) (2 pt) Explain what is apair? (b) (2 pt) Modify pair to support arithmetic between two elements of apair (c) (4 pt) Write a FuncLang program to determine if the two elements of apair are equivalent