Use the following diagram of the streets in a residential neighborhood to answer the question.
A neighborhood watchman patrols the neighborhood each evening. His patrol must cover each street in the neighborhood, beginning and ending at the marked starting point, P. Describe his "optimal route".
◦ the route that requires the least amount of walking, by covering most streets in the neighborhood but not retracing any steps and returning to P
◦ the route along which he is least likely to come across crime
◦ the route that requires the least amount of walking, while still covering the whole neighborhood and returning to P.
◦ the route that require the least amount of walking, while still covering the whole neighborhood, but not necessarily returning to P
◦ the route that requires the least amount of walking, along which he is least likely to come across crime
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