Judy Has Been Asked to Solve the Tower of Hanoi

Multiple Choice

Judy has been asked to solve the Tower of Hanoi problem whereby she has a goal of moving three rings from on post to another post.There are rules to this problem which further complicate the task.Judy is concerned but has decided to break the problem down into intermediate steps.Which approach to problem solving is Judy using

A)  forming subgoals 
B)  using algorithms 
C)  searching for analogies 
D)  using heuristics