Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to cook pork ribs in the oven [title] Preheat the oven to 250 ° f (121 ° c). [title] Combine all of the dry ingredients in a bowl to make the rub. [step] Place the racks rib-side down on a baking sheet or baking dish and roast in the oven for 3 hours.

Ending1: This will give the rub a total of 3 hours. [title] Remove the onions from the oven and place them onto a small plate. Ending2: [title] Rub the mixture evenly onto both sides of the ribs. [step] When thoroughly cooked, the meat should easily separate from the bone. Ending3: It's difficult to do this while the ribs are browning because they are becoming firm. [title] When the skin flakes off, chop the meat into medium round pieces. Ending4: Alternatively, you can roast the pork in a slow cooker, but make sure you do not bake the meat. The meat can be easily burned during the roasting process.

Answer format: ending1/ending2/ending3/ending4