B. Update the communications management plan to include informal requests.
The reason being, a communications management plan outlines the methods, tools, frequency, and other parameters for how communication will occur during the project. When a stakeholder, in this case an executive, expresses a need for a specific type of communication (like a dashboard for project status), it's a cue for the project manager to ensure that the communications management plan reflects these needs to ensure clarity and consistency in future communications. It helps to prevent misunderstandings and ensures that all stakeholders receive the information they need in the format they prefer.