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Which of the following steps in the reaction of KBr using gaseous potassium ions and gaseous bromine atoms are endothermic: I) the addition of an electron to gaseous bromine atom II) the loss of an electron from gaseous potassium ion III) the separation of potassium ion and bromide ion in the potassium bromide solid. A) II only B) Both I and II C) Both I and III D) Both II and III E) all of these