In Which of the Following Situations Is a Lawyer Responsible

In which of the following situations is a lawyer responsible for another lawyer's violation of the Model Rules?

A) If a lawyer orders or, with knowledge, ratifies the other lawyer's conduct.
B) If a lawyer is a partner or has management authority and knows of the other lawyer's conduct at a time when its consequences can be avoided or lessened, but fails to take corrective action.
C) If a lawyer has supervisory authority over the other lawyer and knows of the other lawyer's conduct at a time when its consequences can be avoided or lessened, but fails to take corrective action.
D) All of the above.