The communications management plan is a subsidiary plan of the project management plan that describes how project communications will be planned, executed, and monitored. It should include the stakeholder communication requirements, the information to be communicated, the communication methods and technologies, the frequency and timing of communication, the roles and responsibilities of communicators, and the escalation process for resolving communication issues. If a stakeholder is not receiving the project status report, it means that the communications management plan is not aligned with the stakeholder communication requirements, and it needs to be updated. The project manager should also send the current project status documentation to the missed stakeholder to ensure that they are informed and engaged in the project. This is the best option among the four choices, as it follows the best practices of project communication management and stakeholder management. References: (Professional in Business Analysis Reference Materials source and documents)

A Guide to the Project Management Body of Knowledge (PMBOK® Guide) – Seventh Edition, Chapter 8: Project Communications Management, Section 8.1.3.1: Communications Management Plan

Business Analysis for Practitioners: A Practice Guide, Chapter 4: Planning Business Analysis Work, Section 4.3.2: Communication Plan

Practice Standard for Project Stakeholder Management, Chapter 3: Plan Stakeholder Engagement, Section 3.3.2: Communication Requirements Analysis