Under Which Circumstance Can a Therapist Divulge Information About a Client

Under which circumstance can a therapist divulge information about a client to a third party?

A) when the third party is a qualified psychiatrist or psychologist
B) when the therapist thinks such consultation is in the best interest of the client
C) when the therapist has reason to believe that the client presents a danger to himself or herself or may potentially harm someone else
D) when the therapist is a professor and will use the information to teach