for the following recursive function:

def mystery(lst):

return mystery_aux (lst,0)

def mystery_aux(lst,p):

if p >= len(lst):

return 0

lst[p] += mystery_aux(lst, p +1)

return lst[p]

a) explain what the function does?

b)give an example of input, output and the list content after calling the function.

c)write a function mystery_itertion(lst) that has the same functionality as mystery(lst) but uses iteration instead of recursion.