Which One of the Following Is Not Required by Rule

Which one of the following is not required by Rule 201?

A) Obtain sufficient relevant data to afford a reasonable basis for conclusions or recommendations in relation to any professional services performed.
B) Exercise due professional care in the performance of professional services.
C) Do not disclose any confidential client information without the specific consent of the client.
D) Adequately plan and supervise the performance of professional services.
E) Undertake only those professional services that the member or the member's firm can reasonably expect to be completed with professional competence.