What is the purpose of using outcome measures? Question 18 options: a) They provide a way to assess students' previously acquired skills and knowledge in either one-on-one or group settings. b) They provide a standardized set of criterion-referenced tests for teachers to use at appropriate times in instruction sequencing. c) After a given period of time, they help determine what types of intervention are needed for students not performing at expected levels. d) After a given period of time, they help determine whether students have achieved expected levels of performance