Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to train your dog to play peekaboo [title] Develop your cues. [step] For this trick, you will need a verbal cue: " peekaboo! " you will also need a hand/body signal, in which you will stand with your hands on your hips and your legs spread apart. [title] Place yourself with your back to your dog, standing as described above.

Ending1: [step] Do this in a slow, relaxed manner. You'll need about five to ten repetitions. Ending2: [step] Your back should be straight, but your shoulders up and your chest flat. Your toes should also be flat and your shoulders back. Ending3: [title] Reach through your legs with a treat. [step] This could be a piece of hotdog or maybe a bit of cooked chicken, beef, or liver. Ending4: [step] The trick will not be performed without your shoulders folded forward, either. [substeps] You should be very still when starting off.

Answer format: ending1/ending2/ending3/ending4