Which of the following equations corresponds to an optimal choice point? 
Definitions:
Towers of Hanoi
A mathematical game or puzzle consisting of three rods and a number of disks of different sizes that need to be moved from one rod to another under certain rules.
Reasoning by Analogy
A cognitive process where understanding and problem-solving are achieved by highlighting the similarities between two different situations or domains.
Old Problem
A previously encountered or longstanding issue that has not been resolved.
Similarly Structured Problem
A problem that, despite different contexts or content, shares an underlying structure or logic with another problem, allowing strategies from one to be applied to the other.
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