Alen Bishop earned the fight to use the CFA designation in September 1968. Alen recently retired from the investment management profession. As he is retired, Alen no longer attends CFA Institute society meetings and has stopped paying his CFA Institute dues. According to the Standards of Practice Handbook, how should Alen refer to his affiliation with the CFA Program()

A. Alen Bishop, CFA.

B. Aien Bishop, CFA (retired).

C. "I was awarded the CFA charter in 1968."

复合肥料的主要优点是（）、（）、（）