Answer: C) Disassociation
Step-by-step explanation:
Disassociation is the notification from which either a station or AP existing association are terminated. In dissociation, a station always give notifications before shutting down and leaving the extended service set (ESS) . In this, MAC layer management protect itself from the station which disappear without giving any notification.
This service basically used as distribution services, which basically helps in delivering the message or information within the service.
Therefore, option (C) is correct.