David Sandridge earned the right to use the CFA designation in September 1968. Sandridge recently retired from the investment management profession. As he is retired, Sandridge no longer attends CFA Institute society meetings and has stopped paying his CFA Institute dues. According to the Standards of Practice Handbook, how should Sandridge refer to his affiliation with CFA program（）
A. David Sandridge, CFA.
B. David Sandridge, CFA (retired).
C. "I was awarded the CFA charter in 1968."