What constitutes confidential attorney-client information?

8 We specifically mean the phrase, "confidential attorney-client information," to correspond to the definition of " 'confidential communication between client and lawyer' " contained in Evidence Code section 952: "information transmitted between a client and his [or her] lawyer in the course of that relationship and in confidence by a means which, so far as the client is aware, discloses the information to no third persons other than those who are present to further the interest of the client in the consultation or those to whom disclosure is reasonably necessary for the transmission of the information or the accomplishment of the purpose for which the lawyer is consulted, and includes a legal opinion formed and the advice given by the lawyer in the course of that relationship." The definition encompasses an attorney's legal opinions, impressions, and conclusions, regardless of whether they have been communicated to the client. (Benge v. Superior Court (1982) 131 Cal.App.3d 336, 345, 182 Cal.Rptr. 275; see Cal.Law Revision Com. com., 29B West's Ann.Evid.Code (1991 pocket supp.) 952, p. 74.)