Which of the Following Statements BEST Defines Policing

Which of the following statements BEST defines policing?

A) The process of delaying packets within a traffic stream to have them conform to a defined traffic profile.
B) The overall treatment of a defined subset of a customer's traffic within a DiffServ domain.
C) The process of discarding packets within a traffic stream in accordance with the state of a meter to enforce a defined traffic profile.
D) The action of setting the DiffServ codepoint of a packet prior to its entry into a downstream DiffServ domain.
E) A specified algorithm or operation that is implemented in a node in order to realize one or more per-hop behaviors.