Explanation: Edison type batteries are a specific kind of rechargeable alkaline storage battery, also known as nickel-iron (NiFe) batteries. * **A) Have plates of nickel:** The positive plates in an Edison cell are made of nickel hydroxide, which contains nickel. * **B) Have plates of iron:** The negative plates are made of iron oxide, containing iron. * **C) Have plates of compounds of nickel and iron:** This summarizes the previous two points. The active material on the positive plate is nickel hydroxide (a compound of nickel), and on the negative plate, it's iron oxide (a compound of iron). Since all three statements accurately describe the composition of Edison type batteries, "All of the above" is the correct choice. Understanding different battery chemistries is crucial for amateur radio operators for selecting appropriate power sources for their equipment, whether for base stations, mobile rigs, or portable operations.