An analyst has found an investment with what appears to be a great return-to-risk ratio. The analyst double-checks the data for accuracy, keeps careful records, and is careful to not make any misrepresentations as he simultaneously sends an e-mail to all his clients with a "buy" recommendation. According to Standard Ⅴ (A) , Diligence and Reasonable Basis, the analyst has:（）
A. fulfilled all obligations.
B. violated the Standard if he does not verify whether the investment is appropriate for all the clients.
C. violated the Standard by communicating the recommendation via e-mail.