Jill's Cell Phone Rang During an Exam,and Other Students in the Class

Multiple Choice

Jill's cell phone rang during an exam,and other students in the class turned around and stared at her.The instructor took the opportunity to remind the class that all cell phones should be turned off and put away.Both the class and the instructor used the moment to perform:

A) boundary maintenance
B) an informal sanction
C) labeling
D) a lecture
E) a positive sanction