Carol's daughter Desiree has been disrupting her kindergarten class recently, and she is also struggling to stay on task when doing homework or chores. A school psychologist plans to assess Desiree for psychological disorders, first by sitting in on Desiree's class to conduct __________ and then by having Desiree perform specific cognitive tasks.

a.an interview
b.psychological testing
c.an observation
d.a self-report