Solution 2
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        1) a->b information holds  at the start of function  f after the
           recursive call function.

        2) Yes,  the  pointer  information  a->b holds  at  the  end  of
           function f.

        3) No, pointer information a->b does  not hold after the call to
           function  f.  It  is  because, pointer  information  a->b  is
           generated before the recursive call in function f. Therefore,
           this information is propagated beyond call to f in function f
           and it is modified before propagating it to main function.