Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to choose an energy efficient refrigerator [title] Think about what you want in a new refrigerator. [step] Do you require a built-in or freestanding refrigerator. No-frost of static type? Double door, ice and water dispenser? If you are looking for a cheap model, there are some things you should keep certain things in mind.

Ending1: [title] Know that less expensive models sometimes are older models that do not meet the energy star qualifications. [step] These models are a minimum of 20% less efficient than the energy star rated refrigerators. Ending2: First, think about why you're getting the refrigerator. An increase in temperature in your home often makes it more difficult to keep a freezer well-stocked. Ending3: They all correlate to the cooling requirements that you have. If you want an electric refrigerator, be aware of how cold it will be. Ending4: Make sure you have several options in mind, or you might look for a combination that fits for you. [substeps] Consider outer-shaker refrigerator or system refrigerator.

Answer format: ending1/ending2/ending3/ending4