Your client, a 19-year-old mechanic, confides to you that he recently participated in a robbery. Two weeks later, you are served with a subpoena for information about this client's treatment. You attempt to reach your client but are unable to do so. Legally, you must:

A. Assert client privilege.

B. Notify your client of this subpoena.

C. Turn over all records as per the subpoena.

D. Notify the client's attorney that you cannot reach the client.