Step 1 : Introduction to the question "4. Fire alarms are a key element of a family's emergency preparedness planning. Which of these is the least important aspect of such alarms?"
...1. Proper location of alarms 2. Brand of alarms 3. Adequate number of alarms 4. Batteries tested and charged, if applicable Ideally, individual families, and you personally, should have a plan for disasters and other emergencies. Tip #11 is "Devise a personal and family disaster preparedness plan." You can find guidance on such plans at trusted internet sources. Fire in a home is always a danger. In addition to taking steps to prevent it, you should be prepared with home fire extinguishers in your kitchen, garage, and workshop. Your home should have an adequate number of fire alarms, which should be positioned properly. Check and replace batteries as needed. Develop and practice a fire escape plan, with alternatives. Be sure to have a meeting place outside of your home. Also important are carbon monoxide alarms, especially near your garage (if any). Stock up on emergency food, water, and medical supplies including needed medications. As the Tip says: "Are you prepared to stay at home, if necessary, for two weeks?" Do not overlook the importance of having primary and alternate means of communicating with your family members in case of disruptions in normal channels.