Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to grill chicken breasts [title] Prepare the grill to help the chicken cook better. [step] Use a grill scraper to remove any residue from the grill. Lightly spray the cooking surface with non-stick spray so the chicken will not stick to it.

Ending1: [title] Light the grill, according to your model's instructions, and let preheat on a medium-hot setting for about 5 minutes before placing the chicken onto the grill. [step] Do not overcrowd the chicken breasts on the grill or they may stick together and be difficult to flip over. Ending2: If the grill was reserved for grilling fish, you can also spray it liberally with non-stick spray to help ensure the chicken cooks evenly. [title] Place the cut breasts on the preheated grill. Ending3: Thoroughly sand the grill surface to be sure. If the grill is small enough, dip your nails into barbecue sauce or olive oil to make sure they are thoroughly coated with sauce. Ending4: [substeps] Rub the grill with wood seasoned with vegetable oil or barbecue sauce to tenderize the chicken. [title] Put a pan in the grill with a thermometer.

Answer format: ending1/ending2/ending3/ending4