Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to butterfly a chicken [title] Place the chicken on your cutting board. [step] The chicken should be breast-side down, with the backbone facing up. [title] Cut along both sides of the backbone.

Ending1: [step] Cut along the backbone until you reach the heart. [substeps] The heart of your chicken is the 1 inch (2.5 cm) rib on both sides of the chicken. Ending2: [step] This should leave the pectoral fin intact, thus giving the chicken a rounded and slightly feathered look. [substeps] You can either snip the chicken shut, or simply trim its legs. Ending3: [step] Start on one side at the bottom cavity and cut a straight path to the top cavity. Make the same cut on the other side of the backbone. Ending4: [step] Make sure to make a cut no deeper than 4 inches (10 cm). [substeps] The backbone makes the cut easier and deeper, and prevents bleeding.

Answer format: ending1/ending2/ending3/ending4