Rosa plans to file for bankruptcy under Chapter $7.$ One month prior to filing, Rosa gives Zachary's Filling Station $$700$ to apply to her gasoline bill. Zachary has allowed her to charge the gasoline she needed for her car over the past year. The bankruptcy trustee appointed to the case

cannot cancel the payment to Zachary because it is payment for an existing debt.

can cancel the payment to Zachary as a fraudulent transfer.

can cancel the payment to Zachary as a voidable preference.

cannot cancel the payment to Zachary because he is not an insider.