Debbie Was Observing Classes in a Small Rural School as Part

Debbie was observing classes in a small rural school as part of her study on opportunities in the arts in diverse school districts. She heard several teachers make reference to the upcoming 'play day' within the context of their lessons. Not knowing what the 'play day' was, Debbie pulled the principal aside and asked her to explain. In this example, Debbie is best illustrating a(n)

A) formal interview.
B) structured interview.
C) semi-structured interview.
D) informal interview.