There are two classes named TEACHER and STUDENTS.When TEACHER goes out of the class,STUDENTS should make noise.The scemario best befits to the concept of "association of two classes behavior-where one class watches another class for a behavior change and triggers an action from inside itself based on the behavior change".Which pattern of design it could be?

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Question:
There are two classes named TEACHER and STUDENTS.When TEACHER goes
out of the class,STUDENTS should make noise.The scemario best befits to the
concept of "association of two classes behavior-where one class watches another
class for a behavior change and triggers an action from inside itself based on the
behavior change".Which pattern of design it could be?

1. Singleton patter

2.Template pattern

3. Observer pattern

4.None

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