According to the PMBOK Guide, 6th edition, section 4.6.1.1, the project manager is responsible for communicating the approved changes to the relevant stakeholders and ensuring that the changes are implemented as planned. The project manager should also manage the expectations of the stakeholders and address any issues or concerns that arise from the changes. In this scenario, the project manager should first meet with the operations manager to explain the background for the change and understand the operation manager's concerns about the change. This will help to establish a collaborative relationship and resolve any potential conflicts. The other options are either premature or inappropriate, as they do not address the root cause of the problem or respect the authority of the CCB. References: PMBOK Guide, 6th edition, section
4.6.1.1, page 115.