Explanation
According to the PMBOK Guide, the project manager is responsible for developing the project team by improving their competencies, interactions, and overall performance. One of the tools and techniques for developing the project team is ground rules, which are the mutually agreed-upon standards of behavior that guide the team's actions and interactions. Ground rules can help the project manager establish the expectations, roles, and responsibilities of the team members, as well as the methods and frequency of communication. In this scenario, the project manager is assigned to a new project, and the PMO and the project manager agree that this is the right opportunity to include daily standup meetings, which are short and focused meetings that allow the team to share progress, issues, and plans. The project team has never used such tools, and a few members are challenging the decision, which may indicate a lack of understanding or agreement on the purpose and benefits of daily standup meetings. The best way to handle this situation is to define the ground rules, responsibilities, and conflict management strategies, using ground rules as a tool. This option can help the project manager explain the rationale and objectives of daily standup meetings, clarify the roles and expectations of the team members, and address any concerns or disagreements that may arise.
Engaging an external vendor, requesting new team members, or updating the project schedule are not the best options, as they do not address the issue of team development, or may be unnecessary or impractical to implement. References: PMBOK Guide, 7th edition, pages 215-216, 9.5 Develop Team.