Roberto, an ABA agency owner, has hired an OBM consultant to conduct a performance diagnostics on RBTs who consistently arrive late for sessions as reported by their BCBA supervisors. Which of the following measures would be the MOST valid to identify baseline performance of session arrival times? using a GPS locator that also allows RBTs to clock in when within a mile radius using a Wifi with a password login none of these measures would be appropriate parental report of RBT arrival time O RBTs reporting their arrival time to Roberto