Explanation
= According to the PMBOK Guide, 7th edition, the communications management plan is a component of the project management plan that describes how, when, and by whom information about the project will be shared, stored, and distributed1. It also defines the communication requirements and expectations of the project stakeholders, such as thelevel of detail, frequency, format, and confidentiality of the information2. Therefore, the project manager should have reviewed the communications management plan before inviting an external client representative to the meeting, to ensure that the meeting agenda and content are appropriate and aligned with the stakeholder communication needs and preferences. This would have helped to avoid any potential conflicts, misunderstandings, or surprises that could have caused the CEO to end the meeting abruptly. References:
1: PMBOK Guide, 7th edition, Chapter 4: Plan and Manage Communications, p. 69
2: PMBOK Guide, 7th edition, Chapter 4: Plan and Manage Communications, p. 70-71