Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make duchess potatoes [title] Preheat the oven. [step] The final step in preparing duchess potatoes is baking them in the oven. To ensure that the oven is hot enough when the potatoes are ready, it's important to preheat it.

Ending1: To do this, set the temperature to 350 degrees fahrenheit (176.0 degrees celsius). [substeps] On a gas-powered oven, you can set the temperature to 350 f (176.5 c). Ending2: Set a timer for 15 to 20 minutes after the oven is preheated to allow the potatoes to cool. [substeps] If you prefer, you can place the potatoes in a baking dish to cool completely, and allow them to cool for 5 minutes. Ending3: Set the temperature to 400 degrees fahrenheit (200 degrees celsius), and allow it to fully heat. [substeps] Your oven will alert you that the oven has preheated in some way. Ending4: [substeps] Place your oven rack in a warm, dark area of the oven so it has plenty of ventilation. Bake the potatoes for 30 minutes, or until they are tender and light brown in color.

Answer format: ending1/ending2/ending3/ending4