Problem: A series of research studies asked individuals to recognize the names and faces of people they went to high school with. Even 48 years later, most participants were highly accurate. This research supports which of the following conclusions about memory? a. The sensory register has a potentially unlimited capacity b. Long-term memory has a potentially unlimited duration c. High school can be a traumatic experience for many teenagers d. Short-term memory has a limited duration of about 10-20 seconds without rehearsal