Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to prevent baking a lumpy cake [title] Place oven rack so cake pan will be baking near the center of your oven so the hot air can circulate fully. [step] Make sure rack is level. [title] Preheat oven.

Ending1: [step] Allow cake pan to fully preheat before adding butter to the pan. Butter is great for mashing, which can cause cake batter to stick to oven surfaces. Ending2: [title] Prepare your pans by lining the bottom with parchment paper or waxed paper. [step] Trace the pan on top of the paper you are using, then cut on the line. Ending3: [step] The oven must be preheated to 200 ° f (93 ° c) or range. If oven-bottom is below 200 ° f (93 ° c) for cake pans, wait a few minutes, or turn the rack counter clockwise from the oven. Ending4: [step] If you prefer board pan ovens, the best guidelines are placing them at about 400 ° f (204 ° c). [title] Place cake pan in oven preheated to about 350 ° f (177 ° c).

Answer format: ending1/ending2/ending3/ending4