Final answer:
Under Rule 3.4, a certificant can take custody of client assets if they are clearly identified, meaning that segregation and proper management must be adhered to, ensuring the protection of the client's assets.
Step-by-step explanation:
The question pertains to Rule 3.4 regarding the conduct of certificants in taking custody of client assets. Under this rule, the correct answer to whether a certificant can take custody of client assets is B. Yes, if clearly identified. This means that a certificant is allowed to take custody of client assets, but the assets must be segregated, marked clearly, and managed in a way that is consistent with custody regulations that protect the client's assets. Complete control is not permitted because it can lead to conflicts of interest and potential misuse of assets. Therefore, option A is incorrect. Option C and D are also incorrect as they suggest absolute prohibitions or limitations that are not part of Rule 3.4.