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

How to buy a temporary bed
Consider buying an air mattress.
The air mattress (or " air bed ") is one of the most popular temporary bed solutions for all manner of applications, including camping, moving, and accommodating overnight guests. Benefits of air mattresses include their ability to be stowed away in a small space when not needed and their high level of insulation from cold ground temperatures.

Pick from:
(1). If you live in the northern hemisphere, you'll need a homemade air mattress for shelter during the summer months. You can purchase air mattresses at stores such as home depot or target..
(2). Air mattresses must be inflated using a pump. Using a hand pump can be time consuming and tiring, while using an electric pump requires access to an electrical outlet..
(3). However, you still may need help to connect the air mattress to the heater, power supply, and other fixtures that turn on the air in your accommodation. Your choice of bed setup is critical..
(4). Know the source of the uncomfortable seats. Modern mattresses tend to squeak when exposed to temperatures other than 40 f (4 c)..
The answer is:
(2).