Rule 503(b)(1) of the Texas Rules of Evidence provides that a client has a privilege to refuse to disclose and to prevent any other person from disclosing confidential communications made for the purpose of facilitating the rendition of professional legal services to the client: (A) between the client or a representative of the client and the client's lawyer or a representative of the lawyer or (D) between representatives of the client or between the client and a representative of the client. TEX. R. EVID. 503(b)(1)(A), (D). A "representative of the client" is: (A) a person having authority to obtain professional legal services, or to act on advice thereby rendered, on behalf of the client, or (B) any other person who, for the purpose of effectuating legal representation for the client, makes or receives a confidential communication while acting in the scope of employment for the client. TEX. R. EVID. 503(a)(2)(A), (B). A communication is confidential if not intended to be disclosed to third persons other than those to whom disclosure is made in furtherance of the rendition of professional legal services to the client or those reasonably necessary for the transmission of the communication. TEX. R. EVID. 503(a)(5).