external firm还是自己所在的firm？

问题如下：

Under the guidelines, what is required of professionals before they can accept supplementary rewards beyond their regular compensation? Only from clients. Only from external entities. From both clients and external entities.

选项：

A.Only from clients.

B.Only from external entities.

C.From both clients and external entities.

解释：

Option C is correct as per the guidelines within Standard IV (B), Additional Compensation Arrangements. These guidelines mandate that professionals must secure approval from their principal employer prior to accepting any additional remuneration or benefits from outside sources for services provided to their employer or any activity that could potentially conflict with their employer’s interests. This encompasses both direct payments from clients and indirect benefits or compensations received from external parties.