This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to follow arena etiquette while horseback riding
Put on your helmet.
If you're in the arena, you should be wearing a helmet. Even if you are not mounted or even planning on riding, your presence in the arena requires a helmet.

Options:
(1). Make sure you know the ropes so you don't get blisters from trying to grab something that would potentially damage you. If you do not wear a helmet, do not attempt riding a horseback horse.;
(2). Helmets are important for all athletes, not just you and your rider. Wear it so it is a protective covering against threats and injuries as well as heightens your confidence.;
(3). Mount outside the arena or in the middle of the arena. You should not mount where you will be in another rider's way.;
(4). Helmets are involved in all aspects of riding. Too much wear for your safety can result in injury or even death.;
The answer is:
(3).