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A food delivery company has a distribution center (D) and three delivery zones (\(Z_1\), \(Z_2\), \(Z_3\)). The delivery trucks leave the distribution center to go to \(Z_1\) or \(Z_2\). From \(Z_1\), they can go to \(Z_2\) or \(Z_3\). From \(Z_2\), they can only go to \(Z_3\). Once in \(Z_3\), they return directly to the distribution center D.
Draw a directed graph to illustrate these delivery routes.
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