Carson works with adults in a day treatment center. He is working on promoting staff engagement with the clients who receive services. To evaluate staff performance, he uses a system where he scores the staff on engagement at the end of every 15-minute period. When Carson's timer goes off at the 15-minute mark, he quickly jots down whether each staff member is engaged or not. What type of data collection is this? Whole Interval Frequency Momentary time sampling Duration