9) In a school district, the children in kindergarten and grades 1 through 5 attend the elementary school, the children in grades 6 through 8 attend the middle school, and the children in grades 9 through 12 attend the high school. If there is one president and one secretary chosen from each grade, what is the probability of randomly selecting a class president who is not attending high school from the pool of class officers? a) 13 10 b) 26 9 26 c) d) 26 ​