For many years, John Berger, CFA, has been a mentor of Bob Chennings, a family friend, who just earned the CFA designation. Berger is the CEO of a firm that just hired Chennings, but the hiring was done at a lower level so Berger and Chennings have no direct contact in the daily operation of the firm. With respect to Standard Ⅳ (C), Responsibilities of Supervisors, Berger:（）
A. must develop a set of written procedures to prevent violations derived from his mentoring Chennings.
B. must routinely evaluate Chennings’ performance.
C. assumes no extra responsibility with the hiring of Chennings.