The project manager should first become aware of any cultural characteristics of the new supplier that could impact negotiation. This is an important step to ensure effective communication and collaboration with the overseas company, as well as to avoid any misunderstandings or conflicts that could arise from cultural differences. By becoming aware of the new supplier's cultural values, norms, preferences, and expectations, the project manager can adapt their negotiation style and strategy accordingly, and establish a positive and respectful relationship with the new supplier. This option aligns with the PMBOK Guide, 6th edition, which states that "the project manager should be aware of the cultural characteristics of the parties involved in the negotiation and how they may influence the negotiation process and outcome" (p. 480).