Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to aim a bb gun [title] Familiarize yourself with the parts of your bb gun. [step] Understanding the name and function of each part is essential in maintaining control over your gun at all times. [title] Determine your dominant eye.

Ending1: [step] This is the part of your bb gun that is most normally part of your dominant eye. [substeps] The dominant eye refers to one of the perpendicular channels occurring in the casing of a bb gun at a single time, on the top or bottom of the casing. Ending2: [step] This helps you aim with precision and tells you which side to hold the gun on (if applicable). [substeps] Extend both arms in front of you. Ending3: [step] The dominant eye is the face portion of your bb gun. Typically, this is the side that has the most control. Ending4: [step] The dominant eye is reserved for aiming and uses the goggles to focus on the target and see ahead. Do not use black goggles as they can cause inaccurate vision.

Answer format: ending1/ending2/ending3/ending4