(a) In representing a client, an attorney shall not use means that have no substantial purpose other than to embarrass, delay, or burden a third person, or use methods of obtaining evidence that the attorney knows violate the legal rights of such a person.

(b) An attorney who receives a document, electronically stored information, or other property relating to the representation of the attorney's client and knows or reasonably should know that the document, electronically stored information, or other property was inadvertently sent shall promptly notify the sender.

(c) In communicating with third persons, an attorney representing a client in a matter shall not seek information relating to the matter that the attorney knows or reasonably should know is protected from disclosure by statute or by an established evidentiary privilege, unless the protection has been waived. An attorney who receives information that is protected from disclosure shall (1) terminate the communication immediately and (2) give notice of the disclosure to the person entitled to enforce the protection against disclosure. If the person entitled to enforce the protection against disclosure is represented by an attorney, the notice required by this Rule shall be given to the person's attorney.