A project manager has been managing a highly complex project.

According to the PMBOK Guide, the project manager should ensure that all the required approvals are received per the organizational procedures before implementing any project deliverables. This is part of the control quality process, which involves validating and verifying that the project deliverables meet the quality standards and requirements. By obtaining the necessary approvals, the project manager can avoid any liabilities, penalties, or disputes that may arise from the implementation of the project deliverables. The project manager should not rely on resolving defects, completing tasks, or documenting results alone, as these may not be sufficient to ensure that the project deliverables are acceptable and compliant with the organizational policies and regulations. References: PMBOK Guide, 7th edition, pages 237-238, 241-242.