What should an organization do after it has established the risk communication plan?

Once an organization has established a risk communication plan, it should implement it by establishing both internal and external communication channels to ensure all stakeholders are informed and involved in the risk management process. This step is crucial for maintaining transparency, ensuring clarity, and fostering a collaborative environment where risks are managed effectively. Therefore, option C is the correct answer.

References:

ISO/IEC 27005:2018, Clause 7, "Communication and Consultation," which outlines the importance of establishing both internal and external communication mechanisms to ensure effective risk management.