William Wong, CFA, is an equity analyst with Hayswick Securities. Based on his fundamental analysis, Wong concludes that the stock of a company he follows, Nolvec Inc., is substantially undervalued and will experience a large price increase. He delays revising his recommendation on the stock from "bold" to "buy" to allow his professional conduct that relate to:（）

A. Duty to clients.

B. Reasonable basis.

C. Duty to his employer.

常用夹紧机构有六种，请列举其中任意五种。