Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to be confident during a presentation [title] Practice good posture. [step] Hold your head up and keep your chin in when standing and giving a presentation. Imagine you are stretching the top of your head toward the ceiling.

Ending1: Lift your chin to your chest and relaxed your shoulders. [substeps] Practice this sit it up routine with a friend in front of you and have someone else perform the sit it down exercise with them. Ending2: Once you are confident with the way you hold it, you can move on to your next object. [substeps] Making sure your head is supported in a way that feels right is important for a good presentation. Ending3: Maintaining good posture will make your presentation seem more polished, and show off your good leg strength. [substeps] If you're nervous, ask yourself if you're standing straight. Ending4: Keep your shoulders back and try to keep your earlobes in line with the center of your shoulders. Tuck in your stomach, but be sure not to tilt your pelvis.

Answer format: ending1/ending2/ending3/ending4