In Fig. 7.15 is a ML function main that computes Fibonacci numbers in a nonstandard way. Function f I b O will compute the nth Fibonacci number for any n > 0. Nested within in is f I b l , which...

In Fig. 7.15 is a ML function main that computes Fibonacci numbers in a nonstandard way. Function f I b O will compute the nth Fibonacci number for any n > 0. Nested within in is f I b l , which computes the nth Fibonacci number on the assumption n > 2, and nested within f I b l is f ib2, which assumes n > 4. Note that neither f I b l nor f ib2 need to check for the basis cases. Show the stack of activation records that result from a call to main, up until the time that the first call (to f I b O(l)) is about to return. Show the access link in each of the activation records on the stack.

Fig. 7.15